Blood relations questions test your ability to decode family connections from a chain of statements — usually two to four hops deep — and identify how two people are related. Think of it like untangling a telephone game where each person described the relationship to the next in their own words.
Here is the core challenge: natural language is ambiguous. When someone says "my mother's husband," they almost certainly mean their father — but the question is forcing you to trace the chain rather than assuming. That forced tracing is where most candidates slip up.
The right mental model is a family tree drawn on paper (or in your head during the exam). Place every person on a horizontal generation line. People of the same generation sit at the same level. Parents sit one level above; grandparents two levels above; children one level below. Once you have the tree, the answer is almost always visible at a glance.
Think of it this way: you are a telephone operator in 1985. A call arrives saying "connect me to the father-in-law of the grandson of this woman." You don't guess — you trace the line manually, junction by junction. Blood relation questions work the same way.
The two types you will meet in SSC GD:
Both types collapse to the same skill: draw the tree, assign genders, count the hops.
Before you read beyond the first sentence of any blood relation question, draw a horizontal line on your rough sheet. Label it "Generation 0" — that is the reference person (often the speaker). Draw a line above for Generation +1 (parents, uncles, aunts) and another above that for Generation +2 (grandparents). Draw a line below for Generation -1 (children, nephews, nieces) and one below that for Generation -2 (grandchildren).
Now parse each clause of the question and place each person on the correct level. Use arrows to show the direction of the relationship. Mark gender — M for male, F for female — whenever the question gives a clue.
| Relation | Who it is | |---|---| | Mother's / Father's brother | Maternal / Paternal uncle (चाचा / मामा) | | Mother's / Father's sister | Maternal / Paternal aunt | | Son's wife | Daughter-in-law | | Daughter's husband | Son-in-law | | Wife's / Husband's father | Father-in-law | | Wife's / Husband's mother | Mother-in-law | | Wife's / Husband's sister | Sister-in-law | | Brother's son / daughter | Nephew / Niece | | Sister's son / daughter | Nephew / Niece | | Father's only son (no siblings stated) | The person himself |
That last entry is the most important one in SSC GD questions. Look — the classic question "My father's son is..." with no sibling information means the speaker is talking about himself.
Whenever you see the phrase "only son" or "only daughter," the chain collapses by one step. "My grandfather's only son" — if the speaker has no uncles or aunts — is simply the speaker's father. This collapse is deliberately hidden inside long chains. Train yourself to spot "only" and immediately collapse that node.
Some questions give you a person's name but do not state their gender directly. In those cases:
Step 1 — Anchor the speaker. Who is saying the statement? Place them at Generation 0 on your grid.
Step 2 — Trace outward from the anchor. Each possessive ("his," "her," "my") is one hop. Each relationship word (brother, mother, wife) tells you the direction and the gender of the next node.
Step 3 — Close the loop. The question asks for the relationship between two of the nodes you have placed. With the grid in front of you, read off the relationship directly.
SSC GD occasionally presents blood relations coded as symbols: A + B means A is the father of B, A - B means A is the wife of B, etc. The method is identical — parse each symbol, build the tree, read the answer. Do not try to decode the entire code table first; decode only what you need for the question.
Whenever you see "my father's son" or "my mother's son" in a chain with no mention of siblings, that node points back to the speaker themselves. You eliminate one hop entirely.
Example: "That man's father is my father's son" → my father's son = me → that man's father = me → that man = my son.
Standard trace: 4 hops, ~40 seconds. Mirror collapse: 2 hops, ~15 seconds.
Any time you reach a "wife" or "husband" node, flip the in-law label. If A is the father of B, and B is the husband of C, then A is the father-in-law of C. Equally, C's father-in-law is A.
In the exam hall, when you have traced to "the wife of the grandson of my mother" — you are the father-in-law of that wife, because you are the grandfather of her husband (or one generation above him on the male side).
Standard approach: re-read and guess; error rate ~30%. Reversal rule: apply once, answer in ~10 seconds, error rate near zero.
When two people share the same parents (confirmed in the question), they are siblings of the same generation. Any question that tells you "X is the brother of Y" and "Z is the daughter of Y" immediately places Z one generation below both X and Y.
Use this to instantly eliminate answer options that place the answer in the wrong generation. If you know the relationship must be between generation 0 and generation -1, eliminate "grandfather" and "uncle" from the options without working them out.
Step count: eliminates 2 of 4 options in ~5 seconds before solving, saving ~20 seconds of verification.
"Your brother's only sister" means there is exactly one sister in that sibling group — which is the woman herself. This is the female version of the "father's only son" collapse.
Example: "Your brother's only sister is my mother." → Your brother's only sister = you → you are the man's mother.
Standard trace without this insight: ~35 seconds, with wrong answers common. With the collapse: ~8 seconds.
Count how many generations separate the two people in the question. One generation apart = parent/child or uncle/niece family. Two generations = grandparent/grandchild. Same generation = siblings or cousins.
In a 4-option MCQ, usually two options belong to wrong generations. Counting generations takes ~5 seconds and eliminates those two options immediately. You now have a 50/50 choice for the remaining 20-25 seconds.
In the exam hall, use this decision sequence:
1. Is there an "only son / only daughter" phrase? → Collapse that node to the speaker or the immediate parent. Redraw.
2. Is there a "wife of / husband of" phrase? → Apply the in-law reversal. The person one generation above the spouse is the corresponding in-law.
3. Are there more than three hops? → Draw the tree. Do not attempt to hold a four-hop chain in working memory.
4. Does the question have a named group (like a chain of five people)? → Assign symbols (A, B, C...) instead of names. Map genders. The tree will be cleaner.
5. Is gender ever unspecified for the answer person? → Check whether the option set forces a gender (Father-in-law vs Mother-in-law). If yes, re-read for the gender clue you missed.
6. Still stuck? → Substitute a real family. Replace the abstract statement with your own family members. The concrete version is almost always faster to resolve.
Target time per question: under 45 seconds if you draw the tree; under 25 seconds for two-hop questions using the shortcuts.
Why this question: This is the classic grandson-wife pattern. Tests whether you can flip the in-law relationship correctly.
Solving path: Anil's mother's grandson = Anil's son (one step down, male). The girl is the wife of Anil's son. Anil is the father of the man whose wife she is, so Anil is her father-in-law. Answer: Father-in-law.
Why this question: Tests the "mother's husband" collapse and then a sibling relationship. Very common SSC GD structure.
Solving path: The woman's mother's husband = the woman's father. The woman's father's sister = the woman's (paternal) aunt. The man's aunt is the same person. So the woman's father's sister = the man's aunt → the woman and the man share the same father → they are siblings. Answer: Sister.
Why this question: Contains "only son of my grandfather" — the classic self-reference collapse.
Solving path: Neha's grandfather's only son = Neha's father (collapse using only-son rule). Rajesh's brother's father = Rajesh's father. Both Neha's father and Rajesh's father are the same person. Therefore Neha and Rajesh share the same father — they are siblings. Neha is the sister of Rajesh. Answer: Sister.
Why this question: Multi-person chain. Tests whether you can build a tree across two separate families and find the uncle.
Solving path: Place Bhaskar at Generation 0. Vinod is Bhaskar's brother (same generation). Manohar is Vinod's sister (same generation, female). Preetam is Bhaskar's daughter (Generation -1). Biswal is Preetam's brother (also Generation -1). Biswal's uncle must be Bhaskar's brother = Vinod. Answer: Vinod.
Why this question: Combines the "brother's only sister" self-reference with a maternal grandmother hop.
Solving path: "Your brother's only sister" = the woman herself (only-sister collapse). So the woman is the man's mother. The man's maternal grandmother = the woman's mother. Therefore the woman is the daughter of the man's maternal grandmother. Answer: Daughter.
Why this question: The most-tested "no brother or sister" photograph question across SSC exams. The "no sibling" condition is the key to collapsing the chain.
Solving path: "I have no brother or sister" → my father's son = me (only child). So "that man's father = me." I am that man's father → that man is my son. The photograph is of his son. Answer: His son's.
Why this question: Two-hop chain with a gender pivot. Tests whether you can correctly assign the speaker's relationship to a father.
Solving path: The lady is the only daughter of the woman in the photograph. The photograph-woman's son is Pramod's maternal uncle. So the photograph-woman is Pramod's mother's mother — no, wait: the son of the photograph-woman is Pramod's maternal uncle, meaning the photograph-woman is Pramod's maternal grandmother. The lady (speaker) is the only daughter of that grandmother = Pramod's mother. Pramod's mother is the wife of Pramod's father. Answer: Wife.
Assuming "mother's husband" always means father. It does in most questions, but trace it explicitly. If the question introduces a step-family scenario (rare but possible), you will misread it.
Forgetting to assign gender to ambiguously named people. If the question later says "Manohar is the sister," you must update your tree. Candidates who fix gender at the start based on name alone get the wrong answer.
Ignoring the word "only." Missing "only son" or "only daughter" means you leave a collapse on the table and over-count the family size, leading to an incorrect relationship.
Counting generation hops but forgetting the in-law flip. Reaching "son's wife" and answering "son" instead of "father-in-law" is one of the most common errors in introduction-type questions. Always check: is there a marriage node in the chain? If yes, flip to the in-law label.
Confusing maternal and paternal labels when the question does not specify. In SSC GD, if the answer options distinguish between maternal uncle and paternal uncle, you must track which side of the family each person is on. If the question does not give that information, both options cannot both be in the answer set — one of them is a trap.
Drawing the tree too slowly and running out of time. The fix is to use abbreviations from the start: M = male, F = female, one letter per person, arrows for parent-child direction. A tree for a five-person chain should take under 20 seconds to draw.