Pointing to a person,a man said to a woman,'His mother is the only daughter of your father'. How was the woman related to the person?

Looking at a portrait of a man,Harsh said,"His mother is the wife of my father's son. Brothers and sisters $I$ have none." At whose portrait was Harsh looking?

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

If $P \times Q$ means $P$ is wife of $Q$,$P + Q$ means $P$ is father of $Q$,and $P \div Q$ means $P$ is sister of $Q$,then in $G \times H + R \div D$,how is $G$ related to $D$?

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?

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 $B$. How is $E$ related to $D$?