OT- My family does not accept my step children (children). Kind of long

I've gone through the same thing with my mother in law. I tried to "fix" it and change things in the beginning. I gave up. I explained to my daughters that she is just a mean person who obviously has no class. They are to respect her but that is it. If they don't want to attend things at her home they are free to say no. She treats her biological grandkids by me the same as my two daughters and only favors one of the grandkids by my husband's brother. So be it. It's truly her loss as I have raised and am raising some wonderful caring human beings. I'm not sure how I got to that point of just not caring anymore and I'm not sure how I would be if it was my mom doing it but my husband has very little to do with her now because of the way she is. I wish you luck and I wish I had answers for you.