If T + U means T is the mother of U; T - U means T is husband of U, T ÷ U means T is husband of U is male and T × U means T is sister of U. Then M ÷N + O - P shows which relation of N with P ?

Mother - in - law

ATQ,

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Please note:

  l   ⇒ Vertical line shown "generation gap".

 =  ⇒ Double lines shown "relation of spouse" 

—  ⇒ Horizontal line shown "relation in same generation other than spouse".

     ⇒ Rectangular box shown " Male".

     ⇒ Circular box shown " Female".

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