You just gotta do what's right. Regardless of if your family is dubs that wouldn't piss on you if you were on fire, they're still family and they're your family. We have the obligation regardless of how they feel. Think of the scriptures such as in the book of James about telling someone in need "go in peace, keep warm and well fed" or the one that says "if a man does not take care of those who are his own...". Jesus said "don't let your left hand know what your right hand is doing" meaning pretty much to do what you gotta do without anyone knowing or even acknowledging.
And at the end of the day, you're a better person for it.
Free