$I. A, B, C, D, E$ and $F$ are six members of a family.
$II.$ One couple has parents and their children in the family.
$III. A$ is the son of $C$ and $E$ is the daughter of $A$.
$IV. D$ is the daughter of $F$ who is the mother of $E$.
Which of the following pairs are the parents of the couple?

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

$A$ 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 $D$?

$C$ is $A's$ father's nephew. $D$ is $A's$ cousin but not the brother of $C$. How is $D$ related to $C$?

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 $F$. How is $E$ related to $F$?

$P$ is the brother of $Q$ and $R$. $S$ is $R$'s mother. $T$ is the father of $P$. Which of the following statements cannot be definitely true?