Read the following information and answer the questions that follows:
A family consists of six members P, Q, R, S, T and U.There are two married couples. Q is a doctor and the father of T. U is the grandfather of R and is a contractor S is grandmother of T and is a housewife. There is one doctor, one contractor, one nurse, one housewife and two students in the family.

 Which of the following are two married couples?
(1) US, QT
(2) US, QP
(3) TS,RU
(4) US, RP