In a coded relation, if P × Q means P is the mother of Q, P + R means P is the sister of R, and Q - R means Q is the brother of R, what is the relationship of R to P?
In a coded relation, if A ÷ B means A is the daughter of B, B + C means B is the father of C, and C - D means C is the brother of D, what is the relationship of D to A?