Ilthuain
Lost in a labyrinth of egoism
Tell your friend who has 1.5Mbps Internet that you want to come over and play one of your games, but to start downloading the night before because it will be 10-15GB... take away literally all of his bandwidth so he can't play online.
You can say that he should upgrade his Internet, but welcome to the real world.
How often can you change what 10 accounts are linked? I don't know about you, but there is no fucking way even my most trusted friend is going to have my account information on his system. He can buy his own games or borrow one of my PS4 games.
I imagine your "family" wouldn't store your account/payment info. That would be a nightmare. The system probably has permission regarding game loans and whatnot.
Anyway, bring your disk and login on your account from his xbox.
Problem solved.