Pointing to a photograph,Sachin said,"She is the grandmother of my father's sister's son." How is the woman in the photograph related to Sachin?

Lakshmi and Meena are Rohan's wives. Shalini is Meena's step-daughter. How is Lakshmi related to Shalini?

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

Five persons namely $P, Q, X, Y,$ and $Z$ are sitting in a park. $P$ is the mother of $X$,who is the wife of $Z$. $Y$ is the brother of $P$,and $Q$ is the husband of $P$. How is $Q$ related to $Z$?

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?

Pointing to a photograph,Nikita said,'She is the only granddaughter of my grandmother's daughter'. How is the girl in the photograph related to Nikita?