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

If $A \star B$ means $A$ is the father of $B$,$A \times B$ means $A$ is the mother of $B$,and $A \# B$ means $A$ is the husband of $B$,then which of the following means $P$ is the grandson of $Q$?

$Q's$ 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 $T$?

Deepak said to Nitin,"That boy playing with the football is the younger of the two brothers of the daughter of my father's wife." How is the boy playing football related to Deepak?

In a family,there are six members $A, B, C, D, E$ and $F$. $A$ and $B$ are a married couple,$A$ being the male member. $D$ is the only son of $C$,who is the brother of $A$. $E$ is the sister of $D$. $B$ is the daughter-in-law of $F$,whose husband has died.
How is $F$ related to $C$?

Pointing to a lady,a girl said,'She is the daughter-in-law of the grandmother of my father's only son'. How is the lady related to the girl?