In a certain code language,
‘A $$+$$ B’ means ‘A is the sister of B’,
‘A $$-$$ B’ means ‘A is the father of B’ and
‘A $$\times$$ B’ means ‘A is the brother of B’.
How is R related to S if $$Q + R - P \times N - S$$?

A

Father’s brother

B

Father

C

Brother

D

Father’s father