A, B, C, D, E, F and G are members of a family consisting of four adults, three children, three male and four female. Out of the children, F and G are girls. A and D are brothers and A is a doctor. E is an engineer married to one of the brothers and has two children. B is married to D and G is their child. Who is C?
Explanation
Preparing the family tree using the following symbols,

Given,
1) A, B, C, D, E, F and G are members of a family.
2) consisting of four adults, three children, three male and four female.
3) Out of the children F and G are girls.
4) A and D are brothers and A is a doctor.
5) E is an engineer married to one of the brothers and has two children.
6) B is married to D and G is their child.
Thus,
Here, we see C is the son of A.
Hence, the correct answer is A's son.