Overview: Blood Relations | Reasoning Aptitude for Competitive Examinations - Bank Exams PDF Download

Blood Relation

The relationship established between two individuals by birth is called a blood relation. Blood relations include mother, father, brother, sister, son, daughter, and further extended relations such as grandfather, grandmother, uncle, aunt, cousin, nephew, and niece. Questions on blood relations are a common part of logical-reasoning sections in competitive and entrance examinations. They test a candidate's ability to interpret verbal descriptions of family relationships, convert them into a diagram or logical chain, and then deduce the required relationship.

To solve blood-relation problems efficiently, candidates should follow a stepwise, visual approach: identify the persons mentioned, establish direct relationships, draw a family tree or diagram as required, and then trace the relationship asked in the question.

What is Blood Relation?

Blood relations are relationships that arise by birth. They do not include relationships established only by marriage (in-law relations) unless the question explicitly includes them. Blood relations describe the biological or natal connections among family members and are used to form hierarchical family structures.

Typical blood-relation questions present a set of statements about who is related to whom and ask for the relation between two specific persons. Converting such statements into a pictorial family chart (family tree) or a linear relationship chain simplifies the reasoning and reduces errors.

Common Terms used in Blood Relations

• Father - male parent.
• Mother - female parent.
• Son - male child of parents.
• Daughter - female child of parents.
• Brother - male having at least one common parent.
• Sister - female having at least one common parent.
• Grandfather / Grandmother - parent of a parent.
• Uncle - brother of a parent or husband of an aunt.
• Aunt - sister of a parent or wife of an uncle.
• Cousin - child of an uncle or aunt.
• Nephew / Niece - son / daughter of one's sibling.

Types of Blood-Relation Questions

Blood-relation problems in examinations generally appear in three main forms: introducing or pointing questions, family-tree (chart) questions, and coded-relation questions. Each type requires slightly different handling but all benefit from diagrammatic reasoning and careful attention to gender and qualifiers (such as only, only son, elder/younger, etc.).

Introducing or Pointing

In this type, one person points to or introduces another person and gives a verbal description of a relationship. The task is to interpret the statement and determine how the persons are related.

Example: Pointing toward a person Vineet said to a woman, " His mother is the only daughter of your father." How is the woman related to Vineet?
Solution:

Start from the phrase "the only daughter of your father" - this identifies the woman's daughter (the only daughter) as the subject's mother.

If the woman's daughter is Vineet's mother, then the woman is Vineet's grandmother.

Family Tree or Chart

Family-tree questions present relationships that are best solved by drawing a pedigree or tree. Place generations on horizontal levels and draw direct parent-child lines, marking genders where possible. Use this visual to answer the final relation query.

Example: A and B are brothers, but C and D are sisters. A's son is D's sibling. What exactly is the connection between B and C?
Solution:

A's son is D's sibling, so A's son and D share at least one parent.

Since C and D are sisters, A is the father of both C and D.

If A is the father of C, then B (A's brother) is the uncle of C.

Therefore, B is uncle of C.

Coded Blood Relations

In coded-relation questions, symbols represent basic family relations. The task is to parse the symbolic expression left-to-right or as defined, convert it into relations, draw a small diagram, and deduce the final relationship.

Example:

• If 'A × B' means 'A is the father of B'.
• If 'A + B' means 'A is the wife of B'.
• If 'A ÷ B' means 'A is the daughter of B'.
• If 'A - B' means 'A is the son of B'.

How is L related to Q in the expression 'L ÷ M × O - P ÷ Q'?
Solution:

Interpret the expression step by step from left to right as per given definitions.

L ÷ M means L is the daughter of M.

M × O means M is the father of O, so L is the granddaughter of O.

O - P means O is the son of P, so L is the great-granddaughter of P (descended from O).

P ÷ Q means P is the daughter of Q, so P is a female child of Q.

Therefore, L is the granddaughter of Q's child; the final relation is that L is a granddaughter of Q.

Blood-Relation Reasoning Tricks and Strategy

Applying a set of consistent strategies reduces errors and speeds up solving blood-relation questions.

• Always consider the point of view or the "self" mentioned in the question - many problems are framed from someone's perspective.
• Do not assume gender from names; use explicit statements or symbols only.
• Pay careful attention to qualifiers: "only son", "only daughter", "elder", "younger", "half-sibling", etc., have precise effects on the family structure.
• In coded problems, check the definitions of symbols carefully and then translate the expression into relations before drawing a diagram.
• When multiple interpretations are possible, build a mini-tree for each interpretation and check which one satisfies all given statements.
• Use standard diagram conventions: place older generations above and children below; use lines to connect parents and children; mark gender with ♂ / ♀ or labels if helpful.
• Simplify stepwise: break a long compound relation into small parts, deduce immediate relations, then combine them.

Blood-Relation Chart

A blood-relation chart (family tree) is a pictorial representation showing persons and their relations according to the question. It is the most reliable way to visualise and solve relation problems, especially when several generations or many persons are involved.

Practical Tips and Common Patterns

• "Only daughter of your father" refers to the speaker's sister if the speaker is female, or the speaker herself if she is female and an only daughter - read context carefully.
• "X's son is Y's brother" implies that X is the parent of both Y and the son mentioned.
• "Father's brother" is an uncle; "mother's brother" is also an uncle; the distinction matters only when paternal/maternal sides are specified.
• "Brother of my mother" is maternal uncle; "sister of my father" is paternal aunt; always track which parent's side is referenced.
• Cousins share grandparents; their parent is a sibling of the other parent.

Summary

Blood-relation questions test logical interpretation and careful diagrammatic reasoning. Use clear definitions, avoid assumptions, translate coded relations accurately, and construct family trees whenever necessary. With practice, the standard patterns and shortcuts make these questions quick to solve in exam conditions.