# 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.

## Knowledge of some important relations:

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

## 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.

Her father is P’s father’s father.

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.

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

Learn the basic concepts of Linear Seating Arrangement

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