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Blood Relationship: Basic Concept & Shortcuts

27-NOV-2017 17:14

    Blood Relationship is considered to be one of the most important topics of logical reasoning section for any competitive exam. The students must have a sound knowledge of blood relations in order to solve these questions.


    Blood Relations can be divided into two sides as follows:

    Paternal Relation

    Maternal Relation

    Knowledge of some important relations:

    Other Bloodrelation


    The easiest way to solve the problems based on Blood Relationships would be to draw a tree diagram as follows:


    Relationship structure


    Here are few examples to understand the concept of Blood Relationships:

    Example: P’s father’s Sister’s father is Q. How is Q related to P?


    Here, P’s Father’s sister is P’s Aunt.

    Blood Relation 1

    Her father is P’s father’s father.

    Blood Relation 2

    Therefore, Q is grandfather of P.


    Example: Examine the following relationship among members of a family of six persons - A, B, C, D, E and F:

    • The number of males equals that of females.
    • A and E are sons of F.
    • D is the mother of two, one boy and one girl.
    • B is the son of A.
    • There is one married couple in the family at present.

    Which one of the following inferences can be drawn from the above?

    a)      A, B and C are all females.

    b)      A is the husband of D.

    c)      D is the granddaughter of F

    d)      E and F are children of D.

    Answer: It is clear that there are three males and three females in the family.
                Clearly A, E and B are males. So, C, D, and F are females.
                Also given that D is the mother of one boy and one girl.
                So, A and D form a couple having two children, namely B and C.

    Blood Relation 3

                Hence, A is the husband of D. So, option b) is correct.

    Learn the basic concepts of Linear Seating Arrangement

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