I care for my elderly parents, my mother has end stage MS, and I moved back home to provide the 24 hour care my mother needs and to help my elderly father. My older sister lives two houses down, and works maximum three days a week from her home. My younger sister was fired three months ago and is receiving unemployment. They have come to help with my parents zero times, and in fact enjoy very active social lives. They have never offered to give me any break, they have been consistently absent when I have asked for help during times my mother has had crises (her catheter leaking and soaking through the bed, etc.). I have two nieces and a nephew and because they avoid coming over, I am isolated from them. They are now engaging in family functions like going out to lunch as a family and not even inviting me to join them. When I found out about their latest day of fun today which included lunch nearby that I could have come, I expressed my hurt at being excluded. This is at least the second time this has happened, and both times so far their first approach is to lie to my father who sees I was upset about missing seeing the kids, and tell him I was invited but that I refused to join them. I had all the texts and confronted them with the facts that they had not invited me, they got angry and reprimanded me for being upset and "making a big deal out of it." They almost seem to derive pleasure from knowingly hurting me. It is as if they are sociopathic in their total lack of any empathy not only for the unpleasant and difficult task I have every day, but also for how I would feel knowing they are literally abandoning any and all responsibility and concern for my parents' well-being, but also hurting me by excluding me from their fun activities. I am devastated that they don't even try to make their lies believable, that they seem to enjoy rubbing my nose in the exclusion, and now treat me literally as if I am no longer their sibling but instead as their way to justify doing nothing by dumping all on me. I don't know what to do, i used to have a very close relationship with them, especially the kids, and even my sister in law treats me like I am a stranger who has no relevance. Any advice?