I am getting answer as $3)R$
Since, R= doctor , Q=Teacher, P=Banker. T is married to CA(chartered accountant) and "she" is used for female.So, T is female. T can't be lawyer or engineer and also can't be CA because she got married with him. So, "T" MUST be Architect who earns least. Doctor earns more than engineer and lawyer. Teacher earns less than banker and CA earns learns less than lawyer and more than banker.Now, Based on these 2 facts , we can say Doctor $R$ earns maximum in the family.