It takes awareness that it's not only not a bad thing to let others do things their own way, it is in fact an improvement. It makes life richer and more interesting.
Carolyn HaxYou don't want someone who can't tell the difference between having a different opinion and dismissing your opinion.
Carolyn HaxYour friends will need you, too, someday. Maybe not in the same way, maybe not in cash and shelter, but they'll need you - to listen without judging, to invite them over when they're lonely, to show up for their events, to register in whatever way matters to them that they matter to you. Be on the lookout for these opportunities to give back, and do whatever is in your power not to miss many of them.
Carolyn HaxPlan your own vacations when you want to, and plan a suitable combined vacation with this other family when you want to. If they freak out at your planning your own vacations as you see fit, then let them. Bowing to unreasonable demands because someone will make you pay emotionally if you don't is not a healthy option.
Carolyn Hax