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?

Arun said,"This girl is the wife of the grandson of my mother." Who is Arun to the girl?

There is a family of six persons $A, B, C, D, E,$ and $F$. They are a lawyer,doctor,teacher,salesman,engineer,and accountant. There are two married couples in the family. $D$,the salesman,is married to the lady teacher. The doctor is married to the lawyer. $F$,the accountant,is the son of $B$ and brother of $E$. $C$,the lawyer,is the daughter-in-law of $A$. $E$ is the unmarried engineer. $A$ is the grandmother of $F$. How is $E$ related to $F$?

$A$ man said to a lady,"Your mother's husband's sister is my aunt." How is the lady related to the man?

$(i)$ In a family of six persons $A, B, C, D, E$ and $F$,there are two married couples.
$(ii)$ $D$ is grandmother of $A$ and mother of $B$.
$(iii)$ $C$ is wife of $B$ and mother of $F$.
$(iv)$ $F$ is the granddaughter of $E$.
How many male members are there in the family?

$Q's$ mother is the sister of $P$ and the daughter of $M$. $S$ is the daughter of $P$ and the sister of $T$. How is $M$ related to $T$?