Why this topic matters · 7 min read
Blood Relations is a high-frequency Reasoning topic in SSC GD (2-3 questions per paper). You'll be given a coded family statement and asked to identify the relationship between two people. The exam tests your ability to decode family trees quickly using directional logic and elimination. Most questions are moderate difficulty; speed matters more than complexity.
Core Relationship Vocabulary
Every blood relation problem uses a standard set of family terms. You need to know both the direct meaning and the reverse relationship. For example, if X is the father of Y, then Y is the son of X. The exam often mixes generations (grandparent, uncle, cousin) to confuse you. Learn the terms in pairs so you can work backwards.
- Direct line: Father, Mother, Son, Daughter, Grandfather, Grandmother, Grandson, Granddaughter
- Siblings: Brother, Sister (same parents)
- Aunts/Uncles: Father's/Mother's brother/sister
- Cousins: Children of aunts/uncles (same generation as you)
- In-laws: Spouse's relatives (husband, wife, brother-in-law, sister-in-law)
- Reverse relationships: Always think 'if X is Y's father, then Y is X's son'
Decoding Coded Statements
SSC GD exams use coded language like 'A + B' or 'A × B' to represent relationships. You must memorize the code key given in the question. The trick is to work step-by-step through the family chain without getting lost. Draw a quick family tree on paper if needed—this saves time and prevents errors. Always identify the starting person and trace forward or backward.
- Code key is always provided in the question (e.g., + means father, - means mother, × means brother)
- Work left to right: decode each symbol one at a time
- Draw a simple family tree diagram for complex statements—takes 30 seconds, saves 2 minutes
- Identify gender carefully: some codes apply only to males or females
- Reverse-trace if stuck: start from the answer and work backwards to verify
Worked examples
Example 1: If A + B means 'A is father of B', and B - C means 'B is mother of C', then A + B - C means: A is grandfather of C. (A is father of B, B is mother of C, so A is grandfather of C.)
Example 2: A × B + C means: A's brother's father = A's father. So C is A's father.
Direction & Generation Logic
Many SSC GD questions use directional clues (North, South, East, West) combined with family relationships. This tests your ability to track both spatial and relational information simultaneously. The key is to separate the two: first solve the family relationship, then apply direction if needed. Don't mix them up—they are independent.
- Direction is usually a red herring: solve the blood relation first, then note direction
- Generation gaps matter: grandfather is 2 generations up, uncle is 1 generation up (same as parent)
- Same generation = sibling, cousin, or spouse; different generation = parent, child, aunt, uncle, grandparent
- If confused about generation, count: your generation = 0, parents = +1 up, children = -1 down
Elimination & Multiple Choice Strategy
SSC GD gives 4 options. Use elimination to narrow down. If you're unsure, eliminate impossible relationships first (e.g., if the person is male, they can't be a mother). Then test the remaining options against the given statement. This is faster than trying to solve from scratch.
- Eliminate by gender first: if A is male, A cannot be mother, sister, aunt, or daughter
- Eliminate by generation: if A is older than B, A cannot be B's child or grandchild
- Test each option: assume it's true and check if it matches the given statement
- Watch for 'cannot be determined' option: if the statement is ambiguous, this is often correct
⚠ Common mistakes to avoid
- Mixing up 'brother of' and 'brother-in-law of'—brother-in-law is spouse's brother or sibling's spouse, not a blood relative in the same way
- Forgetting that 'uncle' can be father's brother OR mother's brother—both are uncles, but from different sides of the family
- Losing track of gender in coded statements—a '+' symbol might mean 'father' (male) but you apply it to a female, creating a logical error
- Not drawing a diagram for complex multi-step relationships—trying to solve in your head leads to confusion and wrong answers
- Misreading 'reverse' relationships—if A is X's father, then X is A's son, not A's brother
🧠 Memory aids
- FAMGC: Father, Aunt, Mother, Grandfather, Cousin—covers most direct relationships in order of closeness
- UP = older generation (grandparents, parents, aunts, uncles); SAME = siblings and cousins; DOWN = younger generation (children, grandchildren)
- Gender Rule: -in-law always means spouse's side or sibling's spouse—NOT direct blood
- Draw & Trace: If confused, spend 20 seconds drawing a simple tree. It's faster than re-reading the question 3 times
🎯 SSC GD exam tips
- SSC GD typically asks 2-3 blood relation questions per paper, usually in the first half of the Reasoning section. They are designed to be quick wins if you know the vocabulary.
- Recent papers show a trend toward coded statements with symbols (+ - × ÷) rather than plain English. Memorize the code key immediately when you see it.
- Time pressure is real: aim to solve each blood relation question in under 1.5 minutes. If you're stuck after 90 seconds, mark and move on.
- Watch for 'cannot be determined' as a trap: examiners sometimes include it when the statement is actually clear. Re-read carefully before selecting this option.
- Directional blood relations (with North/South/East/West) are less common in SSC GD than in other exams, but when they appear, solve the family relationship first, then apply direction separately.
Q1 · medium · PYQ 2023
Pointing to a girl, Abhishek said, "She is daughter of the only child of my father." How is Abhishek's wife related to that girl?
- Daughter
- Mother
- Aunt
- Sister
Q2 · medium · PYQ 2023
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 was it?
- His own
- His son's
- His father's
- His nephew's
Q3 · medium · PYQ 2023
Pointing to a boy, Meena says, "He is the son of my grandfather's only son." How is the boy's mother related to Meena?
- Mother
- Aunt
- Sister
- Data inadequate
Q4 · medium · PYQ 2023
A is the brother of B. A is the brother of C. To find what is the relation between B and C. What minimum information from the following is necessary?
(i) Gender of C (ii) Gender of B
- Only (i)
- Only (ii)
- Either (i) or (ii)
- both (i) and (ii)
Q5 · medium · PYQ 2023
P + Q means P is the brother of Q, P × Q means P is the mother of Q, P ÷ Q means P is the father of Q and P – Q means P is the sister of Q. If A × B ÷ C – D + E – F, then how is A related to F?
- Father's sister
- Mother
- Mother's mother
- Father's mother