BM in my case is delusional.

She acts like SHE is still his partner/best friend and I am the outsider. She often speaks to him as if it's the two of them against me even though he has almost no contact with her.

Once she threw a real hissy at drop off. We had gotten fed up with the rags she sent them to our home wearing and every time we'd take them back she bombard us with calls and texts whining about a missing sock or underwear. Most of the times the things she complained about never got to our house in the first place. Anyway, we were fed up and decided that we wouldn't accept a bag of clothes from her anymore - they weren't worth wearing anyway - too small, worn out, holy, faded, stained etc. From now on they'd wear the clothes we bought them, thereby eliminating her constant calls, emails and texts to complain about clothes. At drop off SO tried to give her a bag of clothes (rags) that she had sent over and she flipped out. She started shouting that he was 'harassing' her and started pushing numbers on her phone saying she was calling the police. SO set the bag of clothes at the end of her drive and came back to the car. She ran after him, cursing and screaming at him the whole time and got in the way so he couldn't shut the car door. She was shouting incoherently. Then she reached around him and slapped me shouting 'This is all your fault. You've brought him nothing but misery' Then she rubbed his cheek and said 'oh, sweetie, you poor thing. We'll get through this'. He pushed her out of the way, shut the door and drove off.

Another time at drop off she came out to the car carrying a letter from SD3's pre-school teacher. She read the letter out loud. The teacher was saying SD4 was to be kept home because she had threatened to get a knife and kill another child and that she was a bully. BM picked up SD4 (she was always carrying her around like a baby) and started whining at her 'Weee dooon't huuurt ooour frieeends, noww doon't doo that agaiiin' This went on for 5 minutes, BM whining, SD4 completely ignoring her. Then BM said 'OK you've learned your lesson. Done and dusted. Go play'. SO did not say a single word the entire time. He got in the car and laughed at her attempt at 'discipline'. BM later sent him an email talking about how well the '2 of them' had worked together to handle the situation with SD4.

Once the skids asked me if I was their stepmother when we were watching Cinderella of all things (we aren't married). I said 'well, I guess I fill that role. Do you want me to be your stepmother?'. She said 'not like Cinderella's' I laughed and said 'well, why don't we just be friends then'. That was the end of it. BM sent SO an email that said 'Your gf told our girls that she is their stepmother. She has no right to do this without OUR permission. Tell her that she is not to say anything to the girls without clearing it with US, their PARENTS first'. Thing is, he was right there when the conversation took place.

I have replied to her emails a few times with SO writing the emails WITH me before they were sent. Her reaction EVERY time was to forward them to him to 'let him know' what I was saying to her. She was tattling on me and expecting him to come to her defense, I guess. When he sends her emails or texts that don't give in to her demands she refuses to believe that they came from him and not me.

She simply will not accept that he is no longer under her control. Even when he tells her face to face she insists that he's doing because I'm 'making' him.

She's also delusional about her kid's behaviour. She flat refuses to see that they are less than absolutely perfect. She thinks she's mother of year when her parenting skills are actually quite bad.

This doesn't really bother me anymore. For a long time I thought that she needed to get it through her head but long ago I realized that she never would. Her getting a boyfriend didn't help either.

Do any of you also deal with delusional BMs? What's the most delusional thing she ever did?