Blood Relations Master - Quick Revision
Blood Relations Master - Quick Revision
One-Liners
- Mother’s or Father’s son → Brother
- Mother’s or Father’s daughter → Sister
- Mother’s or Father’s brother → Uncle
- Mother’s or Father’s sister → Aunt
- Uncle’s or Aunt’s son → Cousin
- Uncle’s or Aunt’s daughter → Cousin
- Brother’s or Sister’s son → Nephew
- Brother’s or Sister’s daughter → Niece
- Son’s wife → Daughter-in-law
- Daughter’s husband → Son-in-law
- Sister’s husband → Brother-in-law
- Brother’s wife → Sister-in-law
- Grandson’s mother → Daughter-in-law
- Granddaughter’s father → Son-in-law
- Father of my spouse → Father-in-law
- Mother of my spouse → Mother-in-law
- Spouse of my sibling → Brother/Sister-in-law
- My spouse’s sibling → Brother/Sister-in-law
- Only child’s father → Self (if male) / Husband (if female)
- Only child’s mother → Self (if female) / Wife (if male)
| Formula |
Use |
| P − Q |
P is father of Q (arrow: P → Q) |
| P + Q |
P is mother of Q (arrow: P → Q) |
| P × Q |
P is brother of Q (same generation) |
| P ÷ Q |
P is sister of Q (same generation) |
| P (m) |
P is male |
| P (f) |
P is female |
| P — Q (vertical) |
P is one generation above Q |
| P = Q |
P & Q are spouses |
| P * Q |
P is child of Q (reverse arrow) |
Memory Tricks
- “MAIDS” – Mother, Aunt, In-law, Daughter, Sister → always female by default.
- “FUBU” – Father, Uncle, Brother, Son → default male unless stated.
- “C-words” – Cousin, Child, Can-be-either; check sex tag.
- Generation Ladder: Grand → Parent → Self → Child → Grand (never skip 2 steps).
- In-law Rule: Add “in-law” only when marriage connects two families.
Common Errors
| Error |
Correct |
| Treating cousin as sibling |
Cousins share grandparents, not parents |
| Forgetting spouse’s siblings are also in-laws |
Brother-in-law = spouse’s brother OR sister’s husband |
| Assuming uncle’s child = nephew |
Uncle’s child is cousin, not nephew |
| Confusing maternal & paternal |
Maternal = mother’s side; Paternal = father’s side |
| Reading “A is B’s son” as A is father |
Reverse: B is parent, A is child |
5 Quick MCQs
1. Pointing to a man, a woman says, “His mother is the only daughter of my mother.” How is the woman related to the man?
**Answer:** Mother (only daughter of her mother is herself).
2. A is B’s sister. C is B’s mother. D is C’s father. E is D’s mother. How is A related to D?
**Answer:** Granddaughter.
3. If X is the brother of the son of Y’s son, how is X related to Y?
**Answer:** Grandson.
4. Introducing a boy, a girl said, “He is the son of the daughter of the father of my uncle.” How is the boy related to the girl?
**Answer:** Cousin.
5. A man points to a photograph and says, “I have no brother or sister but that man’s father is my father’s son.” Whose photograph is it?
**Answer:** His own son’s photograph.
BETA
