Question

'I × J' means 'I is the mother of J' 'I + J' means 'I is the husband of J'  'I ÷ J' means 'I is the sister of J'  I – J means 'I is the brother of J' How is Q related to Z in the expression 'Q ÷ X + Y × Z'? 

A Father's sister
B Wife's sister
C Daughter
D Wife
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