This is what I think now considering that Rajiv and Parvez are supposed to share a birthday. Rajiv has a twin (Parvez). For some reason they were seperated at birth. Remember Rajiv's mother died when he was small. Maybe she died during labour and someone may have given away one baby thinking that it would be difficult to raise two kids motherless. A muslim family may have adopted the other baby and named him Parvez. Now Parvez is married and has a daughter. For some reason he cannot be with his family (maybe he is dead or is undergoing some treatment). So Rajiv who may have come to know about his twin, is covering up for him. There was some mention about somebody having cancer is'nt it? Is it possible that Parvez is the one having cancer and does not want his family to know about it?
It is all very confusing. But I think the truth will finally come out next week going by the preview.