31.
In a certain code language,
‘A + B’ means ‘A is the mother of B’,
‘A – B’ means ‘A is the daughter of B’,
‘A × B’ means ‘A is the husband of B’,
‘A ÷ B’ means ‘A is the sister of B’.
Based on the above, how is M related to Q if ‘M ÷ N – O × P + Q’?