$A$ girl introduced a boy as the son of the daughter of the father of her uncle. The boy is the girl's:

$A$ woman walking with a boy meets another woman and on being asked about her relationship with the boy,she says,'My maternal uncle and his maternal uncle's maternal uncle are brothers'. How is the boy related to the woman?

Pointing to a lady,Rajan said,"She is the daughter of the woman who is the mother of the husband of my mother." Who is the lady to Rajan?

Pointing to a photograph,a woman says,"This man's son's sister is my mother-in-law." How is the woman's husband related to the man in the photograph?

$A, B, C, D, E, F$ and $G$ are members of a family consisting of four adults and three children. Two 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. $A$ is the son of $C$. Who is $C$?

Introducing a man,a woman said,"His wife is the only daughter of my father." How is that man related to the woman?