You may start small....just work on the one relationship between you and your sister, rather than your sister and the entire family. That may be too must all at once. If there were bad words, or deeds, apologize, and try to make amends. Offer support by your actions too, not just words. Send helpful items, offer to drive to doctor appointments etc. Perhaps if you can heal this one bond, then you can work together on the larger ones? Small steps first.

Emmy