# Blood Relationship: Basic Concept & Shortcuts

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:**

**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:

**RELATIONSHIPS FROM ONE GENERATION TO NEXT**

**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?

**Answer**:

**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.**