This is probably going to be long, I apologise in advance.
I've been with my DP 4 years, I have 3 kids by EH. He was highly abusive, he has no contact with the kids.
DP has 2 kids, DSD12 and DSS8. Different mothers.
We waited over a year to do introductions, all was fine to start, apart from DSS mum, (she is quite a nasty woman, had police involvement due to her attacking DPs elderly mum amongst other things)
She went mental when she found out about me, it wasn't a pleasant time.
DSDs mum was amazing, we really got on well, she was lovely. I gained a really great relationship with DSD too.
Now for the problem.
Last year things took a drastic turn, DSD was here for our weekend, the day before she was due to go home, she made some worrying claims to DP, she told him her step dad was horrible to her, made some claims about him and things he'd done, also made some claims about her mum too.
She asked if she could stay with us, DP said yes and that he would sort it with mum and talk about the claims she had made.
All hell broke loose, it was horrendous, mum took it bad, (as expected, I'd be devastated too)
DP called SS due to the nature of the claims, mum refuted all claims. DP was advised to keep her with us.
The next three months were awful, things were investigated, rightly or wrongly I refused to have anything to do with it, I would comfort DSD when she was upset, but I didn't want any involvement in the situation as I felt it was between mum, DP and DSD.
DSS mum found out and refused to let DSS see DP because of the situation.
DSD started therapy, paid for by us, to help her get through it all.
One day, completely out of the blue, DSD ran back to her mums, we then received a phone call from her therapist, DSD had disclosed to her therapist that she'd made it all up. This was proven to be true by SS, as the days she'd said events happened, step dad proved he was at work, DSD also then admitted to her SW that she had made it up. No reasoning as to why.
Following on, DSD refused to come back to ours, was sending nasty messages to DP and myself, I didn't respond and just blocked her number. As I felt it was nothing to do with me.
Mum started sending abuse then, turns out, DSD started making claims about me, saying I forced her to stay and I was horrible to her. Mum believed it. She came to the house to scream at me, it was just horrible.
Just to add to it all, around 3 months later, DSS mum contacted DP to say that DSS isn't his, she'd had a DNA done to confirm. She admitted to cheating on him all through the marriage. She said DP could no longer see DSS now, as he isn't his.
Finally, all the drama with DSD is still ongoing, she is still being nasty, aiming everything at me. (I haven't spoken to her or mum since it all happened)
Last night she sent a message to DP which said, it's time to choose between me and SM, I don't want anything to do with you whilst your with her, and I'm your only child so think wisely.
DP is heartbroken, absolutely devastated, there aren't any words to describe it to be honest.
I don't know what to do, I told DP I would leave, I don't want to stand in the way of him and his daughter, he's begged me not too. But I just don't know what to do, it's a horrible, awful situation, which just seems to be getting worse.
I'm sorry it's so long, I've tried my best to include everything.