'M $$\times$$ N means 'M is the mother of N'
'M + N' means 'M is the father of N'
'M $$\div$$ N' means 'M is the sister of N'
'M - N' means 'M is the brother of N'
How is X related to Y in the expression '$$X \div Z - A \times Y$$'?

A

Husband's sister

B

Sister

C

Father's sister

D

Mother's sister