Q:

If P + Q means that P is the mother of Q, P ÷ Q means that P is the father of Q, P – Q means that P is the sister of Q, then which of the following expression shows that A is the maternal grandfather of C?

• 1
  B ÷ A + C
• 2
  A – B ÷ C
• 3
  A + B ÷ C
• 4
  A ÷ B + C