If P is the brother of Q and R is the sister of Q, then how is Q related to P?

Pointing towards a person in a photograph, Anita said, 'He is the only son of the father of my sister's brother'.

How is that person related to Anita?

Pointing to a woman in a photograph, a man says, 'She is the only daughter of the only daughter of my brother-in-law's father'. How is the woman related to the man?

Pointing to a woman in a photograph, a man says, 'She is the mother of my son's only daughter'.

How is the woman related to the man in the photograph?

Pointing to a man in a photograph, a woman says, 'He is the father of the only grandson of my father-in-law'.

How is the man related to the woman?

Pointing to a man in a photograph, a woman says, 'He is the only son of the only daughter-in-law of my only son's father'.

How is the man related to the woman?

A said to B that B's mother was the mother-in-law of A's mother.

How is A's mother related to B's mother?

Pointing to a woman in a photograph, a man says, 'She is the only daughter of my only son's mother-in-law'.

How is the woman related to the man?

Pointing to a woman in a photograph, a man says, 'She is the only daughter of my father's only daughter-in-law'.

How is the woman related to the man?