Introducing Rajesh,Neha said,"His brother's father is the only son of my grandfather." How is Neha related to Rajesh?

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?

$D$ is $A's$ son. $C$ is the mother of $P$ and wife of $D$. How is $A$ related to $C$?

Daya has a brother,Anil. Daya is the son of Chandra. Bimal is Chandra's father. In terms of relationship,what is Anil to Bimal?

$A$ 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?

$A$ is the son of $B$; $C$,$B$'s sister,has a son $D$ and a daughter $E$; $F$ is the maternal uncle of $D$. How many nephews does $F$ have?