In a certain code language: A + B means 'A is the mother of B' A − B means 'A is the brother of B' A × B means 'A is the wife of B' A ÷ B means 'A is the father of B' Based on the expression 'U − P × Q ÷ R + S − T', how is R related to U?

M is the brother of N, O is the father of M, P is the brother of Q, and Q is the daughter of N. How is M related to Q?

If 'P + Q' means 'P is the father of Q', 'P × Q' means 'P is the brother of Q', and 'P - Q' means 'P is the mother of Q', then which of the following is true about the expression A × B - C + D?