My DM prefers my sister to me always has. And prefers me DN's to my DC. My other siblings follow suit.
The end for me was two years ago when my entire family said during a festival (Xmas equivalent for us), that we wouldn't be doing presents this year. I always go all out and enjoy getting gifts and decorating house and baking special cakes etc for the occasion.
But was told not to that year. So I didn't.
My DC told me that my DN's had received gifts from everyone, DC are not grabby at all, & at the time I was on very limited income as I was getting divorced and going thro awful awful childrens hearing to protect my two from abusive ex.
But this meant my DC were used to not having lots of things and have never complained, eldest never even asks for anything other than practical things she needs (even now).
But that was the final straw for me, I did not expect my family to get my DC elaborate gifts, was used to them gifting dn's brats dolls and DS games etc, I was deeply hurt however that they could give one set of DC gifts and completely leave out mine not even gift them a set of pound shop pens between them.
I've been no contact with them since.
They've been nasty to me all my life but they do not have permission to mistreat my DC.
I understand they're pissed off with me over it. But I really don't care.
DM did attempt to invite me to festival celebrations the following year, I declined. DC didn't want to go and neither did I.
I actually don't like my mother and don't love her at all. She was really nasty to me growing up. And hates that I'm close and loving with my DC. She appears to hate that we love eachother. She's a strange woman.