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

$P$ is the son of $Q$,while $Q$ and $R$ are sisters. $T$ is the mother of $R$. If $S$ is the son of $T$,which of the following statements is correct?

Pointing to a lady,a girl said,'She is the daughter-in-law of the grandmother of my father's only son'. How is the lady related to the girl?

Study the following information carefully to answer the question.
$(i)$ $P \times Q$ 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 $M$ is daughter of $R$?

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 many children does $A$ have?

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