One couple is QP.

Now, R and U are the children of T. So, the other couple is TS.

T is a teacher.

S is a female doctor.

Q is a lawyer.

Clearly, P is a housewife and hence a female.

S is the mother of R and U.

P has one son and on grandson.

Clearly, T is the son of P and R or U is the grandson.

The grandson is a male engineer and the grand-daughter is a student.

Hence, **P is the housewife.**