Pointing to a photograph,Vipul said,"She is the daughter of my grandfather's only son." How is Vipul related to the girl in the photograph?

Read the following information carefully and answer the question given below. All the six members of a family $A, B, C, D, E,$ and $F$ are travelling together. $B$ is the son of $C$ but $C$ is not the mother of $B$. $A$ and $C$ are a married couple. $E$ is the brother of $C$. $D$ is the daughter of $A$. $F$ is the brother of $B$. Who is the wife of $E$?

$E$ is the son of $A$. $D$ is the son of $B$. $E$ is married to $C$. $C$ is the daughter of $B$. How is $D$ related to $E$?

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

$A$ is the brother of $R$. $C$ is the mother of $B$. $M$ is the sister of $C$. How is $M$ related to $B$?

$P$ is the father of $J$. $S$ is the mother of $N$,who is the brother of $J$. $B$ is the son of $S$. $C$ is the sister of $B$. How is $J$ related to $C$?