If ‘P → Q’ means ‘P is the husband of Q’

If ‘P + Q’ means ‘P is the father of Q’

If ‘P £ Q’ means ‘P is the mother of Q’

If ‘P @ Q’ means ‘P is the brother of Q’

If ‘P ÷ Q’ means ‘P is the sister of Q’

If ‘P − Q’ means ‘P is the son of Q’

If ‘P ↔ Q’ means ‘P is the daughter of Q’

If ‘P & Q’ means ‘P is the wife of Q’

If ‘W ↔ X – Y £ Z’ is given, then which of the following is definitely true?