In a certain code language,
‘$$A + B$$’ means ‘$$A$$ is the mother of $$B$$’,
‘$$A - B$$’ means ‘$$A$$ is the father of $$B$$’,
‘$$A \times B$$’ means ‘$$A$$ is the brother of $$B$$’ and
‘$$A  \&  B$$’ means ‘$$A$$ is the wife of $$B$$’.
How is $$N$$ related to $$R$$ if $$N  \&  P - Q + T \times R$$ ?

A

Mother’s mother

B

Father’s mother

C

Mother

D

Mother’s sister