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

$A$ family consists of six members $P, Q, R, X, Y,$ and $Z$. $Q$ is the son of $R$ but $R$ is not the mother of $Q$. $P$ and $R$ are a married couple. $Y$ is the brother of $R$. $X$ is the daughter of $P$. $Z$ is the brother of $P$.
Who is the brother-in-law of $R$?

Pointing towards a person in a photograph,Anjali said,"He is the only son of the father of my sister's brother." How is that person related to Anjali?

Introducing Rajesh,Neha said,"His brother's father is the only son of my grandfather." How is Neha related to Rajesh?

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 $Q$?

$A \div B$ 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 $B$,$A + B$ means $A$ is the daughter of $B$.
If $P \div R + Q$,which of the following is true?