A is father of B, B is mother of C and D. Therefore, A is grandfather of D.

Mother of my mother = Grandmother.

The only daughter of my mother = myself. So his mother is the woman. Therefore, the man is her son.

A is brother of B, B is sister of C (so A and C are siblings), C is mother of D. Therefore A is uncle of D.

My father's son = myself (X). My father's son's wife = X's wife. So Y's mother is X's wife, making Y the son of X. X is Y's father. Wait - reconsidering: Y's mother is wife of X. So X is Y's father.

B is son of A. E is sister of B. Therefore, E is also child of A, making A the father of E.

P is male (father). T is male (brother). R's gender unclear. S's gender unclear. Q is female (mother). Insufficient information.

My mother's only son = myself (Arun). So the person is the son of Arun = Arun's son.

O is father of M. P is brother of O. So P is uncle of M. M is mother of N. So P is great-uncle (great-grand-uncle) of N.

Arranging based on clues: C-A-E-F-G and B-C. Order: B-C-A-E-F-G-D or similar. With 7 people, 4th position is middle. After arrangement: C is in middle position.