Blood Relation Test— Concepts, Formulas & Shortcuts
- Always draw the tree. Use squares/plus for male, circles/minus for female, a horizontal line for married and a vertical line for parent–child.
- Place generations on separate levels so no relation can be misread.
- Solve self-referential statements from the inside out: "my father's son" = the speaker himself (if he has no brother).
- Same generation = brother/sister/cousin; one level up = parent/uncle/aunt; one level down = child/nephew/niece.
- In coded relations (P + Q, P − Q), write the code key at the top and translate symbol by symbol left to right.
- Gender is not always determinable — "cousin", "child" and some options are deliberately gender-neutral.
Blood Relation Test Practice Questions with Answers
Attempt each question first, then open the explanation. All 18 questions below are free to read and require no signup.
Q1.Pointing to a photograph, a man said, "I have no brother or sister, but that man's father is my father's son." Whose photograph is it?
Difficult- AHis own
- BHis son
- CHis father
- DHis nephew
Blood Relation Test question 1 of 18+Show Answer & Explanation
Answer: B. His son
Explanation: With no siblings, "my father's son" is the speaker himself. So the speaker is that man's father — the photograph shows his son.
Q2.A is B's sister, C is B's mother, D is C's father and E is D's mother. How is A related to D?
Moderate- AGrandmother
- BGranddaughter
- CDaughter
- DGreat-granddaughter
Blood Relation Test question 2 of 18+Show Answer & Explanation
Answer: B. Granddaughter
Explanation: D is C's father, C is the mother of A and B, so D is A's grandfather and A is his granddaughter.
Q3.Pointing to a lady, Ravi said, "She is the daughter of my grandfather's only son." How is she related to Ravi?
Moderate- AMother
- BSister
- CAunt
- DCousin
Blood Relation Test question 3 of 18+Show Answer & Explanation
Answer: B. Sister
Explanation: Grandfather's only son is Ravi's father, so his daughter is Ravi's sister.
Q4.P is the brother of Q, Q is the sister of R, and R is the father of S. How is P related to S?
Moderate- AFather
- BBrother
- CUncle
- DGrandfather
Blood Relation Test question 4 of 18+Show Answer & Explanation
Answer: C. Uncle
Explanation: P and R are siblings (through Q), and S is R's child, so P is S's uncle.
Q5.If "A + B" means A is the mother of B and "A − B" means A is the brother of B, then what does "P + Q − R" mean?
Moderate- AP is the mother of R
- BP is the sister of R
- CP is the aunt of R
- DP is the father of R
Blood Relation Test question 5 of 18+Show Answer & Explanation
Answer: A. P is the mother of R
Explanation: P is the mother of Q, and Q is the brother of R, so P is also the mother of R.
Q6.Introducing a man, a woman said, "His wife is the only daughter of my father." How is the man related to the woman?
Moderate- ABrother
- BFather
- CHusband
- DUncle
Blood Relation Test question 6 of 18+Show Answer & Explanation
Answer: C. Husband
Explanation: The only daughter of her father is the woman herself, so the man's wife is the woman — he is her husband.
Q7.Pointing to a boy, Meena said, "He is the son of my mother's only son." How is the boy related to Meena?
Moderate- ASon
- BBrother
- CNephew
- DCousin
Blood Relation Test question 7 of 18+Show Answer & Explanation
Answer: C. Nephew
Explanation: Her mother's only son is Meena's brother, so the brother's son is her nephew.
Q8.X's father is the only son of Y's grandfather. How is Y related to X?
Difficult- ABrother or sister
- BCousin
- CUncle
- DCannot be determined
Blood Relation Test question 8 of 18+Show Answer & Explanation
Answer: A. Brother or sister
Explanation: Y's grandfather has only one son, who is X's father — and that same son must be Y's father. So X and Y are siblings, though the exact gender is unstated.
Q9.A is the father of B. B is the sister of C. C is the mother of D. How is A related to D?
Moderate- AFather
- BGrandfather
- CUncle
- DBrother
Blood Relation Test question 9 of 18+Show Answer & Explanation
Answer: B. Grandfather
Explanation: A is the parent of C (through B being C's sibling), and D is C's child, so A is D's grandfather.
Q10.Pointing to a girl, Ram said, "She is the only daughter of my mother's only child." How is the girl related to Ram?
Moderate- ASister
- BNiece
- CDaughter
- DCousin
Blood Relation Test question 10 of 18+Show Answer & Explanation
Answer: C. Daughter
Explanation: Ram's mother's only child is Ram himself, so the girl is his daughter.
Q11.If P is the son of Q, and Q is the sister of R, how is R related to P?
Moderate- AFather
- BUncle or aunt
- CBrother
- DGrandfather
Blood Relation Test question 11 of 18+Show Answer & Explanation
Answer: B. Uncle or aunt
Explanation: R is the sibling of P's mother, so R is P's uncle or aunt — the gender of R is not stated.
Q12.A woman said, "That man's mother is the only daughter of my mother." How is the woman related to the man?
Difficult- ASister
- BMother
- CAunt
- DGrandmother
Blood Relation Test question 12 of 18+Show Answer & Explanation
Answer: B. Mother
Explanation: The only daughter of her mother is the woman herself, so she is that man's mother.
Q13.X is the brother of Y. Z is the father of X. W is the brother of Z. How is W related to Y?
Moderate- AFather
- BUncle
- CBrother
- DCousin
Blood Relation Test question 13 of 18+Show Answer & Explanation
Answer: B. Uncle
Explanation: W is the brother of Y's father, making him Y's uncle.
Q14.If A + B means A is the father of B, and A − B means A is the wife of B, what does P + Q − R mean?
Difficult- AP is the father of R
- BQ is the wife of R
- CP is the mother of R
- DR is the son of P
Blood Relation Test question 14 of 18+Show Answer & Explanation
Answer: B. Q is the wife of R
Explanation: P is the father of Q, and Q is the wife of R — so the relation established about Q is that she is R's wife.
Q15.Introducing a boy, a man said, "He is the son of the sister of my father." How is the boy related to the man?
Moderate- ABrother
- BNephew
- CCousin
- DUncle
Blood Relation Test question 15 of 18+Show Answer & Explanation
Answer: C. Cousin
Explanation: His father's sister is his aunt, and her son is his cousin.
Q16.A is the mother of B and C. If D is the husband of C, what is A to D?
Easy- AMother
- BMother-in-law
- CSister
- DAunt
Blood Relation Test question 16 of 18+Show Answer & Explanation
Answer: B. Mother-in-law
Explanation: A is the mother of D's wife, which makes her D's mother-in-law.
Q17.In a family, M is the son of N, but N is not the son of M. P is the daughter of M. How is N related to P?
Moderate- AFather
- BGrandparent
- CUncle
- DBrother
Blood Relation Test question 17 of 18+Show Answer & Explanation
Answer: B. Grandparent
Explanation: N is M's parent and P is M's daughter, so N is P's grandparent.
Q18.Pointing at a photograph, a woman said, "He is the brother of my father's only son." Whose photograph is it?
Difficult- AHer father
- BHer brother
- CHer son
- DCannot be determined
Blood Relation Test question 18 of 18+Show Answer & Explanation
Answer: D. Cannot be determined
Explanation: Her father's only son is her brother. That brother's brother cannot exist if he is the ONLY son — so no consistent relation is determinable.
Blood Relation Test — Frequently Asked Questions
How do I solve "my father's son" style questions?+
Work from the innermost phrase outwards. If the speaker is male and has no brother, "my father's son" is the speaker himself, so "that man's father is my father's son" means the speaker is that man's father — the photograph is of his son.
Should I really draw a diagram in the exam?+
Yes. It costs 15 seconds and eliminates the single largest error source in this topic. Mental tracking fails as soon as three generations appear.
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