There is family, and there are relatives. Sometimes they are the same people, but not always and not necessarily. When people cut you out of their lives, sometimes without caring enough to even tell you, that's them struggling with their insecurities, fears, self-loathing, or regrets. Don't take it on. If they love their politics, their money, their religion, or their bigotries more than you, that is their deficit, not yours.
And, if people are happy to keep you in their lives but mostly as an emotional punching bag, then don't take on guilt if you need to walk away. You can do it without bitterness and with an openness to future reconciliation, but love doesn't mean being anyone's doormat.
Love yourself and be thankful for those who love you (as you are, not as they insist you should be), but don't let yourself be too miserable if the ones who do love you aren't the ones you once thought were "supposed to."
In the end, the silly games, dramas, and petty conflicts won't matter to any of us, except for the time they caused us to waste.