Pointing to a lady,a man said,"The son of her only brother is the brother of my wife." How is the lady related to the man?

Rita told Mani,"The girl $I$ met yesterday at the beach was the youngest daughter of the brother-in-law of my friend's mother." How is the girl related to Rita's friend?

Pointing to a photograph,Arun said,'She is the mother of my brother's son's wife's daughter.' How is Arun related to the lady?

Pointing to a lady,a man said,'The son of her only brother is the brother of my wife'. How is the lady related to the man?

$A + B$ means $A$ is the father of $B$; $A - B$ means $A$ is the wife of $B$; $A \times B$ means $A$ is the brother of $B$; $A \div B$ means $A$ is the daughter of $B$. If $P - R + Q$,which of the following statements is true?

$A$ is the father of $C$. But $C$ is not his son.
$E$ is the daughter of $C$. $F$ is the spouse of $A$.
$B$ is the brother of $C$. $D$ is the son of $B$.
$G$ is the spouse of $B$. $H$ is the father of $G$.
Who is the son of $F$?