20+ Blood Relations Questions and Answers

Blood Relations Questions is a common topic in reasoning sections of many competitive exams that test your logical thinking and understanding of family connections. In these questions, you are given a set of clues or statements describing relationships between different family members, and you must determine how two individuals are related to each other.

Mastering Blood Relation questions boosts your ability to think clearly, organize information, and apply reasoning all essential skills for exams like SSC CGL, CHSL, MTS, Bank PO & Clerk exams, Railway Recruitment Boards (RRBs), CAT, GRE, GMAT, LSAT, CLAT, and various state-level exams. In this blog, we have discussed 20+ Blood Relation questions, terms used in them, types, and more. Let’s dive in!

What are Blood Relation Questions?

The main concept behind the blood relations questions is to determine how the individual is related to the other members of their family. In such questions, a family tree will be presented, and based on that, a number of questions are framed. To score well, it is advised to familiarise yourself with the different kinds of relations that a family can have. This will reduce the overall time needed to crack these questions. Listed below are some of the family members: 

• Niece 
• Sister in Law
• Grandmother
• Mother
• Sister
• Father
• Brother
• Nephew 
• Grandfather
• Aunt

Terms Used in Blood Relation Questions

Before you start understanding and solving Blood Relation questions, the most basic requirement is to clearly know the different terms related to the relationships between family members. These standard relationship terms are tabulated below for quick reference:

S.No.	Relationship	Term Used
1.	Mother of Grandmother or Mother of Grandfather	Great Grandmother
2.	Father of Grandmother or Father of Grandfather	Great Grandfather
3.	Mother’s Mother or Father’s Mother	Grandmother
4.	Mother’s Father or Father’s Father	Grandfather
5.	Father’s Brother	Uncle
6.	Mother’s Brother	Maternal Uncle
7.	Aunt’s Son or Uncle’s Son	Cousin
8.	Aunt’s Daughter or Uncle’s Daughter	Cousin
9.	Mother’s Daughter or Father’s Daughter	Sister
10.	Mother’s Son or Father’s Son	Brother
11.	Sister’s Daughter or Brother’s Daughter	Niece
12.	Sister’s Son or Brother’s Son	Nephew
13.	Father’s Sister	Aunt
14.	Mother’s Sister	Aunt
15.	Wife’s Brother or Husband’s Brother	Brother-in-law
16.	Wife’s Father or Husband’s Father	Father-in-law
17.	Wife’s Sister or Husband’s Sister	Sister-in-law
18.	Wife’s Mother or Husband’s Mother	Mother-in-law
19.	Son’s Wife	Daughter-in-law
20.	Daughter’s Husband	Son-in-law

Also Read: 20+ Questions of Cause and Effect Reasoning

Types of Blood Relation Questions

Not all blood relations questions are created equal. Modern competitive exams categorise these questions into distinct types, each requiring a slightly different approach. Knowing the type the moment you read the question helps you choose the fastest solving method. Here, we’ll explore the four major types you’ll encounter and how to identify them instantly.

• Mixed Blood Relations
• Puzzle-Based Blood Relation
• Single-Person Blood Relation
• Coded Blood Relations

Blood Relations Questions and Tricks

To ace the blood relations questions for competitive exams, it is important to improve speed and accuracy. Here are a few tricks you can use to determine the relations specified in the question:

• Use the ‘+’ to represent a female member
• Use the ‘-’ to represent a male member
• Use ‘=’ to represent couples 
• Use a single line to represent siblings 
• Use vertical lines to represent relationships between different generations
• In case the statements do not establish a relationship between the members, use ‘?’ for easier understanding. 

20+ Blood Relations Questions and Answers

To better understand the concept of blood relations questions for competitive exams, let us have a look at these questions and answer them: 

Question 1

A is B’s sister. B is C’s mother. D is C’s sister. How is A related to D? 

a) Mother 

b) Sister

c) Aunt 

d) Grandmother

Answer: c) Aunt 

Solution: A is B’s sister → B is C’s mother → D is C’s sister. Since A is the sister of C’s mother (B), A is C’s aunt. As D is C’s sister, A is also D’s aunt.

Question 2

Pointing to a man, Ritika said, “His mother is the only daughter of my mother.” How is Ritika related to the man? 

a) Mother 

b) Sister 

c) Aunt 

d) Daughter

Answer: a) Mother 

Solution: “Only daughter of my mother” means Ritika herself. So the man’s mother is Ritika, making Ritika the man’s mother.

Question 3

If A + B means A is the father of B, A × B means A is the sister of B, A $ B means A is the wife of B, and A % B means A is the mother of B, then what does P × Q + R % S mean? 

a) P is the aunt of S 

b) P is the sister of S 

c) P is the mother of S 

d) P is the grandmother of S

Answer: a) P is the aunt of S 

Solution: P × Q (P is sister of Q) + Q + R (Q is father of R) % R % S (R is mother of S). So P is Q’s sister, Q is R’s father, and R is S’s mother. Therefore, P is S’s aunt (father’s sister).

Question 4

Introducing a man, a woman said, “He is the only son of my mother’s mother.” How is the woman related to the man? 

a) Mother 

b) Sister 

c) Niece 

d) Aunt

Answer: c) Niece 

Solution: “Only son of my mother’s mother” means the woman’s maternal uncle. So the woman is the man’s niece.

Question 5

A man said to a lady, “Your mother’s husband’s sister is my aunt.” How is the lady related to the man? 

a) Daughter 

b) Sister 

c) Mother 

d) Niece

Answer: b) Sister 

Solution: Lady’s mother’s husband = Lady’s father. Lady’s father’s sister = Lady’s aunt. If the lady’s aunt is the man’s aunt too, then they are siblings.

Question 6

If P is the brother of Q, Q is the sister of R, and R is the father of S, then which of the following statements is correct? 

a) P is the uncle of S 

b) P is the father of S 

c) P is the grandfather of S 

d) P is the brother of S

Answer: a) P is the uncle of S 

Solution: P is brother of Q → Q is sister of R → R is father of S. Since P is the brother of S’s father (R), P is S’s uncle.

Question 7

Deepak said to Nitin, “That boy playing with the football is the younger of the two brothers of the daughter of my father’s wife.” How is the boy related to Deepak? 

a) Son 

b) Brother 

c) Cousin 

d) Brother-in-law

Answer: b) Brother 

Solution: “Daughter of my father’s wife” = Deepak’s sister. “Younger of two brothers of his sister” = Deepak’s younger brother.

Question 8

A woman introduces a man as the son of the brother of her mother. How is the man related to the woman? 

a) Nephew 

b) Son 

c) Cousin 

d) Uncle

Answer: c) Cousin 

Solution: Brother of her mother = Her uncle. Son of her uncle = Her cousin.

Question 9

Pointing to a photograph, Anjali said, “This man’s son’s sister is my mother-in-law.” How is Anjali’s husband related to the man in the photograph? 

a) Grandson 

b) Son 

c) Nephew 

d) Son-in-law

Answer: a) Grandson 

Solution: Man’s son’s sister = Man’s daughter. If man’s daughter is Anjali’s mother-in-law, then Anjali’s husband is the man’s grandson.

Question 10

If A says that B’s mother is the only daughter of A’s mother, then how is A related to B? 

a) Brother 

b) Father 

c) Mother 

d) Uncle

Answer: c) Mother 

Solution: “Only daughter of A’s mother” = A herself (if A is female). So B’s mother is A, making A the mother of B.

Question 11

X and Y are brothers. R is the father of Y. S is the brother of T and maternal uncle of X. What is T to R? 

a) Brother 

b) Wife 

c) Sister 

d) Brother-in-law

Answer: b) Wife 

Solution: S is maternal uncle of X, so S is X’s mother’s brother. Since S is brother of T, T is also X’s mother’s sibling. Since X and Y are brothers with same parents, T is Y’s mother too. As R is Y’s father, T is R’s wife.

Question 12

A man pointing to a photograph says, “The lady in the photograph is my nephew’s maternal grandmother.” How is the lady related to the man’s sister? 

a) Sister-in-law 

b) Mother 

c) Mother-in-law 

d) Sister

Answer: c) Mother-in-law 

Solution: Man’s nephew’s maternal grandmother = Man’s sister’s mother-in-law (assuming the nephew is man’s sister’s son).

Question 13

Looking at a portrait, Aditi said, “Anirudh is the father of the only sister of my son.” How is Anirudh related to Aditi? 

a) Brother-in-law 

b) Husband 

c) Brother 

d) Son

Answer: b) Husband 

Solution: “Only sister of my son” = Aditi’s daughter. If Anirudh is the father of Aditi’s daughter, then Anirudh is Aditi’s husband.

Question 14

P’s father Q is B’s paternal uncle. If A is the father of Q, then how is P related to B? 

a) Brother 

b) Cousin 

c) Uncle 

d) Nephew

Answer: b) Cousin 

Solution: Q is B’s paternal uncle → A is father of Q → A is also B’s grandfather. Since P’s father is Q, and Q is B’s uncle, P and B are cousins.

Question 15

Amit said, “This girl is the wife of the grandson of my mother.” How is Amit related to the girl? 

a) Father-in-law 

b) Grandfather 

c) Husband 

d) Father

Answer: a) Father-in-law 

Solution: Grandson of Amit’s mother = Amit’s nephew or Amit’s son. If it’s Amit’s son, then the girl is Amit’s daughter-in-law, making Amit her father-in-law.

Question 16

A is the son of B. C is the daughter of A. D is the brother of B. E is the son of D. What is the relationship between C and E? 

a) Cousins 

b) Sister and brother 

c) Niece and uncle 

d) Aunt and nephew

Answer: a) Cousins 

Solution: A is son of B → C is daughter of A → D is brother of B → E is son of D. Since C’s grandfather (B) and E’s father (D) are brothers, C and E are cousins.

Question 17

Introducing Sonia, Aamir says, “She is the wife of the only nephew of the only brother of my mother.” How is Sonia related to Aamir? 

a) Wife 

b) Sister-in-law 

c) Niece 

d) Sister

Answer: b) Sister-in-law 

Solution: Only brother of Aamir’s mother = Aamir’s uncle. Only nephew of uncle = Aamir’s cousin/brother. Wife of Aamir’s brother = Aamir’s sister-in-law.

Question 18

If M is the brother of N, N is the sister of O, and O is the husband of P, then which of the following is true? 

a) M is the brother-in-law of P 

b) M is the husband of P 

c) M is the father of P 

d) M is the son of P

Answer: a) M is the brother-in-law of P 

Solution: M is brother of N → N is sister of O → O is husband of P. Since M is the brother of P’s husband’s sister, M is P’s brother-in-law.

Question 19

Pointing to a lady, Meera said, “She is the daughter-in-law of the grandmother of my father’s only son.” How is the lady related to Meera? 

a) Sister-in-law 

b) Mother 

c) Aunt 

d) Sister

Answer: b) Mother 

Solution: “My father’s only son” = Meera’s brother or Meera herself (if male). Grandmother of father’s son = Father’s mother. Daughter-in-law of father’s mother = Father’s wife = Meera’s mother.

Question 20

A and B are married couple. X and Y are brothers. X is the brother of A. How is Y related to B? 

a) Brother-in-law 

b) Brother 

c) Cousin 

d) Son-in-law

Answer: a) Brother-in-law 

Solution: X is brother of A → A and B are married → Y is brother of X. Since Y is the brother of B’s spouse’s brother, Y is B’s brother-in-law.

Question 21

Ravi said, “The woman who is playing cards is the daughter of the father of my wife’s daughter.” How is the woman related to Ravi? 

a) Wife 

b) Mother-in-law 

c) Daughter 

d) Sister-in-law

Answer: a) Wife 

Solution: “My wife’s daughter” = Ravi’s daughter. “Father of my wife’s daughter” = Ravi himself. “Daughter of father” = Ravi’s daughter or wife. Since it’s a woman playing cards, it’s likely Ravi’s wife.

Question 22

P and Q are brothers. R and S are sisters. P’s son is S’s brother. How is Q related to R? 

a) Uncle 

b) Father 

c) Brother 

d) Nephew

Answer: a) Uncle 

Solution: P’s son is S’s brother → P is father of S → R and S are sisters → P is also father of R. Since P and Q are brothers, Q is uncle of R.

Question 23

A man said to a woman, “Your only brother’s son is my wife’s brother.” How is the woman related to the man’s wife? 

a) Sister 

b) Mother-in-law 

c) Mother 

d) Sister-in-law

Answer: c) Mother 

Solution: Woman’s brother’s son = Woman’s nephew. If woman’s nephew is man’s wife’s brother, then woman is the mother of man’s wife.

Question 24

If A × B means A is the sister of B, A + B means A is the mother of B, A ÷ B means A is the brother of B, then which of the following means M is the maternal uncle of N? 

a) M ÷ P + N 

b) M × P + N

c) M + P × N 

d) P + N ÷ M

Answer: a) M ÷ P + N 

Solution: For M to be maternal uncle of N, M should be brother of N’s mother. M ÷ P (M is brother of P) + P + N (P is mother of N) = M is maternal uncle of N.

Question 25

Seema said, “This man’s daughter is the only daughter-in-law of my mother.” How is Seema related to the man? 

a) Wife 

b) Daughter-in-law 

c) Sister-in-law 

d) Mother-in-law

Answer: d) Mother-in-law 

Solution: “Only daughter-in-law of my mother” = Seema’s sister-in-law (wife of Seema’s brother). If man’s daughter is Seema’s sister-in-law, then Seema is the man’s daughter-in-law’s mother-in-law.

Question 26

A woman introduces a man as the son of her mother’s only son. How is the man related to the woman? 

a) Son 

b) Brother 

c) Nephew 

d) Cousin

Answer: a) Son 

Solution: “My mother’s only son” = The woman’s brother (or herself if she has no brothers but is male, which is impossible). Most likely, it means her brother. “Son of her brother” = Her nephew. But if “only son” refers to the woman herself in a male context, then it’s her son.

Question 27

Pointing to a man in a photograph, Asha said, “His mother’s only daughter is my mother.” How is Asha related to the man? 

a) Niece 

b) Sister 

c) Mother 

d) Daughter

Answer: a) Niece 

Solution: “His mother’s only daughter” = His sister. If his sister is Asha’s mother, then Asha is the man’s niece.

Question 28

If P $ Q means P is the father of Q, P # Q means P is the mother of Q, P * Q means P is the sister of Q, then how is A related to C in A # B $ C? 

a) Mother 

b) Grandmother

c) Sister 

d) Aunt

Answer: b) Grandmother 

Solution: A # B (A is mother of B) $ B $ C (B is father of C). So A is mother of B, and B is father of C. Therefore, A is grandmother of C.

Question 29

A man’s photograph is shown to Rajesh. Rajesh said, “His brother is the father of my daughter’s mother.” How is the man related to Rajesh? 

a) Brother-in-law 

b) Uncle 

c) Brother 

d) Father

Answer: b) Uncle 

Solution: “My daughter’s mother” = Rajesh’s wife. “Father of my wife” = Rajesh’s father-in-law. If man’s brother is Rajesh’s father-in-law, then the man is Rajesh’s wife’s uncle, making him Rajesh’s uncle-in-law or uncle.

Question 30

Neha said, “Pointing to a boy in the photograph, he is the son of the only son of my grandfather.” How is the boy related to Neha? 

a) Brother 

b) Cousin 

c) Uncle 

d) Nephew

Answer: a) Brother Solution: “Only son of my grandfather” = Neha’s father. “Son of my father” = Neha’s brother.

Also Read: 20+ Questions of Arithmetic Reasoning

Tips for Solving Blood Relations Questions

Even after knowing the tricks, small mistakes like misreading gender or overlooking the word “only” can cost you marks. This section shares battle-tested, expert tips that eliminate 95% of common errors in blood relations questions. Follow these guidelines during your practice and watch your speed and accuracy skyrocket in the actual exam.

1. Draw family trees when complex relationships are involved
2. Pay attention to gender indicators in the language
3. Work step by step, breaking down complex statements
4. Remember that “only son” or “only daughter” indicates there’s just one child of that gender
5. Practice identifying coded relationships (×, +, $, %, ÷ symbols)
6. Be careful with terms like “mother-in-law,” “sister-in-law,” etc.
7. Read the question carefully – sometimes the question asks for a specific person’s relationship, not the speaker’s

By the end of this guide, you’ll have everything you need to dominate blood relations questions in any competitive exam. Consistent practice using the terms, tricks, and questions provided here will turn this topic into one of your strongest areas. Start applying these methods today, track your progress with daily quizzes, and walk into your exam confident of scoring full marks in blood relations!

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