Hajj & Umrah

Hajj-e-badal

Q: I want to perform Hajj for the second time. Can I perform this Hajj as Hajj-e-badal for my father as he is not well since he has hypertensive, sugar and prostate problems. I have problem with a mahram. My 15 year old nephew will turn 16 soon. Can he go with me as a mahram?