$X$ told $Y$,"Though $I$ am the son of your father,you are not my brother". How is $X$ related to $Y$?

Pointing to the lady in the photograph,Mrinalini said,"Her son's father is the only son-in-law of my mother". How is Mrinalini related to the lady?

Pointing to a man in a photograph,a woman said,'His brother's father is the only son of my grandfather'. How is the woman related to the man in the photograph?

If,$(A)$ $P + Q$ means $P$ is the brother of $Q$,$(B)$ $P \times Q$ means $P$ is the father of $Q$,$(C)$ $P - Q$ means $P$ is the sister of $Q$,which of the following represents $S$ is the niece of $T$?

$A$ 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 $P$.
How many children does $P$ have?

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 mother of $Q$
$(iv)$ $P \div Q$ means $P$ is father of $Q$
Which of the following means $K$ is maternal uncle of $W$?