Pointing to a photograph,a lady tells Pramod,"$I$ am the only daughter of this lady and her son is your maternal uncle." How is the speaker related to Pramod's father?

Study the following information carefully to answer these questions.
$(i)$ $P \times Q$ means $P$ is brother of $Q$.
$(ii)$ $P - Q$ means $P$ is sister of $Q$.
$(iii)$ $P + Q$ means $P$ is father of $Q$.
$(iv)$ $P \div Q$ means $P$ is mother of $Q$.
Which of the following represents $M$ is nephew of $N$?

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

Pointing to an old man,Kailash said,"His son is my son's uncle." How is the old man related to Kailash?

If $X$ is the brother of the son of $Y$'s son,how is $X$ related to $Y$?

$A$ 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 $R$?