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