IBPS RRB Assistant 2026 — Blood Relations (20 Practice MCQs)
Sharpen your exam readiness with this curated set of 20 MCQs on Blood Relations for IBPS RRB Assistant 2026. Each question is followed by a detailed explanation to help you understand the reasoning — not just memorise answers.
Section: Reasoning Ability | Topic: Blood Relations | Questions: 20 | Difficulty: Mixed (Easy to Hard)
Q1. A is the father of B. B is the sister of C. D is the mother of C. How is A related to D?
- A) Brother
- B) Husband
- C) Father
- D) Son
Show Answer & Explanation
Answer: B) Husband
A is father of B; D is mother of C; B and C are siblings, so they share parents. A and D are the parents — hence Husband and Wife.
A is father of B; D is mother of C; B and C are siblings, so they share parents. A and D are the parents — hence Husband and Wife.
Q2. Pointing to a woman, Ram says 'She is the daughter of my grandfather's only son.' How is the woman related to Ram?
- A) Sister
- B) Cousin
- C) Aunt
- D) Mother
Show Answer & Explanation
Answer: A) Sister
Grandfather's only son = Ram's father. Father's daughter = Ram's sister.
Grandfather's only son = Ram's father. Father's daughter = Ram's sister.
Q3. If X is the brother of Y, Y is the sister of Z, and Z is the father of W — how is X related to W?
- A) Uncle
- B) Father
- C) Grandfather
- D) Brother
Show Answer & Explanation
Answer: A) Uncle
X is Y's brother. Y is Z's sister. Z is W's father. So X and Z are siblings → X is W's uncle.
X is Y's brother. Y is Z's sister. Z is W's father. So X and Z are siblings → X is W's uncle.
Q4. P says to Q: 'Your mother's husband's sister is my mother.' How is Q related to P?
- A) Cousin
- B) Nephew/Niece
- C) Sibling
- D) Uncle/Aunt
Show Answer & Explanation
Answer: A) Cousin
Q's mother's husband = Q's father. Q's father's sister = P's mother. So P's mother is Q's paternal aunt → P and Q are cousins.
Q's mother's husband = Q's father. Q's father's sister = P's mother. So P's mother is Q's paternal aunt → P and Q are cousins.
Q5. In a family of 6, A is the brother of B. C is the mother of A. D is the father of B. E is the son of A. F is the daughter of B. How many male members are there?
- A) 2
- B) 3
- C) 4
- D) Cannot determine
Show Answer & Explanation
Answer: D) Cannot determine
A and E are male, D is male (3 confirmed). B's gender is unspecified. Without B's gender we can't determine total.
A and E are male, D is male (3 confirmed). B's gender is unspecified. Without B's gender we can't determine total.
Q6. A is the father of B. B is the sister of C. D is the mother of C. How is A related to D?
- A) Brother
- B) Husband
- C) Father
- D) Son
Show Answer & Explanation
Answer: B) Husband
A is father of B; D is mother of C; B and C are siblings, so they share parents. A and D are the parents — hence Husband and Wife.
A is father of B; D is mother of C; B and C are siblings, so they share parents. A and D are the parents — hence Husband and Wife.
Q7. Pointing to a woman, Ram says 'She is the daughter of my grandfather's only son.' How is the woman related to Ram?
- A) Sister
- B) Cousin
- C) Aunt
- D) Mother
Show Answer & Explanation
Answer: A) Sister
Grandfather's only son = Ram's father. Father's daughter = Ram's sister.
Grandfather's only son = Ram's father. Father's daughter = Ram's sister.
Q8. If X is the brother of Y, Y is the sister of Z, and Z is the father of W — how is X related to W?
- A) Uncle
- B) Father
- C) Grandfather
- D) Brother
Show Answer & Explanation
Answer: A) Uncle
X is Y's brother. Y is Z's sister. Z is W's father. So X and Z are siblings → X is W's uncle.
X is Y's brother. Y is Z's sister. Z is W's father. So X and Z are siblings → X is W's uncle.
Q9. P says to Q: 'Your mother's husband's sister is my mother.' How is Q related to P?
- A) Cousin
- B) Nephew/Niece
- C) Sibling
- D) Uncle/Aunt
Show Answer & Explanation
Answer: A) Cousin
Q's mother's husband = Q's father. Q's father's sister = P's mother. So P's mother is Q's paternal aunt → P and Q are cousins.
Q's mother's husband = Q's father. Q's father's sister = P's mother. So P's mother is Q's paternal aunt → P and Q are cousins.
Q10. In a family of 6, A is the brother of B. C is the mother of A. D is the father of B. E is the son of A. F is the daughter of B. How many male members are there?
- A) 2
- B) 3
- C) 4
- D) Cannot determine
Show Answer & Explanation
Answer: D) Cannot determine
A and E are male, D is male (3 confirmed). B's gender is unspecified. Without B's gender we can't determine total.
A and E are male, D is male (3 confirmed). B's gender is unspecified. Without B's gender we can't determine total.
Q11. A is the father of B. B is the sister of C. D is the mother of C. How is A related to D?
- A) Brother
- B) Husband
- C) Father
- D) Son
Show Answer & Explanation
Answer: B) Husband
A is father of B; D is mother of C; B and C are siblings, so they share parents. A and D are the parents — hence Husband and Wife.
A is father of B; D is mother of C; B and C are siblings, so they share parents. A and D are the parents — hence Husband and Wife.
Q12. Pointing to a woman, Ram says 'She is the daughter of my grandfather's only son.' How is the woman related to Ram?
- A) Sister
- B) Cousin
- C) Aunt
- D) Mother
Show Answer & Explanation
Answer: A) Sister
Grandfather's only son = Ram's father. Father's daughter = Ram's sister.
Grandfather's only son = Ram's father. Father's daughter = Ram's sister.
Q13. If X is the brother of Y, Y is the sister of Z, and Z is the father of W — how is X related to W?
- A) Uncle
- B) Father
- C) Grandfather
- D) Brother
Show Answer & Explanation
Answer: A) Uncle
X is Y's brother. Y is Z's sister. Z is W's father. So X and Z are siblings → X is W's uncle.
X is Y's brother. Y is Z's sister. Z is W's father. So X and Z are siblings → X is W's uncle.
Q14. P says to Q: 'Your mother's husband's sister is my mother.' How is Q related to P?
- A) Cousin
- B) Nephew/Niece
- C) Sibling
- D) Uncle/Aunt
Show Answer & Explanation
Answer: A) Cousin
Q's mother's husband = Q's father. Q's father's sister = P's mother. So P's mother is Q's paternal aunt → P and Q are cousins.
Q's mother's husband = Q's father. Q's father's sister = P's mother. So P's mother is Q's paternal aunt → P and Q are cousins.
Q15. In a family of 6, A is the brother of B. C is the mother of A. D is the father of B. E is the son of A. F is the daughter of B. How many male members are there?
- A) 2
- B) 3
- C) 4
- D) Cannot determine
Show Answer & Explanation
Answer: D) Cannot determine
A and E are male, D is male (3 confirmed). B's gender is unspecified. Without B's gender we can't determine total.
A and E are male, D is male (3 confirmed). B's gender is unspecified. Without B's gender we can't determine total.
Q16. A is the father of B. B is the sister of C. D is the mother of C. How is A related to D?
- A) Brother
- B) Husband
- C) Father
- D) Son
Show Answer & Explanation
Answer: B) Husband
A is father of B; D is mother of C; B and C are siblings, so they share parents. A and D are the parents — hence Husband and Wife.
A is father of B; D is mother of C; B and C are siblings, so they share parents. A and D are the parents — hence Husband and Wife.
Q17. Pointing to a woman, Ram says 'She is the daughter of my grandfather's only son.' How is the woman related to Ram?
- A) Sister
- B) Cousin
- C) Aunt
- D) Mother
Show Answer & Explanation
Answer: A) Sister
Grandfather's only son = Ram's father. Father's daughter = Ram's sister.
Grandfather's only son = Ram's father. Father's daughter = Ram's sister.
Q18. If X is the brother of Y, Y is the sister of Z, and Z is the father of W — how is X related to W?
- A) Uncle
- B) Father
- C) Grandfather
- D) Brother
Show Answer & Explanation
Answer: A) Uncle
X is Y's brother. Y is Z's sister. Z is W's father. So X and Z are siblings → X is W's uncle.
X is Y's brother. Y is Z's sister. Z is W's father. So X and Z are siblings → X is W's uncle.
Q19. P says to Q: 'Your mother's husband's sister is my mother.' How is Q related to P?
- A) Cousin
- B) Nephew/Niece
- C) Sibling
- D) Uncle/Aunt
Show Answer & Explanation
Answer: A) Cousin
Q's mother's husband = Q's father. Q's father's sister = P's mother. So P's mother is Q's paternal aunt → P and Q are cousins.
Q's mother's husband = Q's father. Q's father's sister = P's mother. So P's mother is Q's paternal aunt → P and Q are cousins.
Q20. In a family of 6, A is the brother of B. C is the mother of A. D is the father of B. E is the son of A. F is the daughter of B. How many male members are there?
- A) 2
- B) 3
- C) 4
- D) Cannot determine
Show Answer & Explanation
Answer: D) Cannot determine
A and E are male, D is male (3 confirmed). B's gender is unspecified. Without B's gender we can't determine total.
A and E are male, D is male (3 confirmed). B's gender is unspecified. Without B's gender we can't determine total.
Exam Strategy for Blood Relations: In IBPS RRB Assistant, aim to solve Blood Relations questions in 45–60 seconds each. If a puzzle question is taking over 2 minutes, skip and return later.
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