Read the following coded relationships carefully: - A4B means A is the husband of B. - A3B means A is the wife of B. - A5B means A is the sister of B. - A7B means A is the brother of B. In the expression P4Q5R5S, what is the relationship of P's son to S?

In a certain code language: 'A + B' means 'A is the mother of B'; 'A - B' means 'A is the father of B'; 'A $ B' means 'A is the son of B'; and 'A % B' means 'A is the sister of B'. Which of the following expressions means that 'O is the father of R'? (I) M - N % Q $ R + O (II) O - M $ N + Q % R (III) Q - N $ O % M + R (IV) O + M $ R - Q % N

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 this, how is F related to H in the expression 'E - F + G × H ÷ I'?