Showing a lady in the park,Ashok said,'She is the daughter of my grandfather's only son'. How is Ashok related to that lady?

$A$ is the father of $C$. But $C$ is not his son. $E$ is the daughter of $C$. $F$ is the spouse of $A$. $B$ is the brother of $C$. $D$ is the son of $B$. $G$ is the spouse of $B$. $H$ is the father of $G$. Who is the grandmother of $D$?

There is a family of six persons $A, B, C, D, E$ and $F$. They are Lawyer,Doctor,Teacher,Salesman,Engineer and Accountant. There are two married couples in the family. $D$,the Salesman,is married to the Lady Teacher. The Doctor is married to the Lawyer. $F$,the Accountant,is the son of $B$ and brother of $E$. $C$,the Lawyer,is the daughter-in-law of $A$. $E$ is the unmarried Engineer. $A$ is the grandmother of $F$. What is the profession of $A$?

$A$ is the brother of $B$. $B$ is the brother of $C$. $D$ is the father of $A$. Based on these three statements,which of the following statements cannot be definitely true?

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 $W$?

$(i)$ In a family of six persons $A, B, C, D, E$ and $F$,there are two married couples.
$(ii)$ $D$ is the grandmother of $A$ and mother of $B$.
$(iii)$ $C$ is the wife of $B$ and mother of $F$.
$(iv)$ $F$ is the granddaughter of $E$.
Which of the following is true?