I need to vent😭

Seriously I need to vent and get stuff off my chest!! Sorry for the long post! 😬

My fiance and I broke up last fall for like 3 weeks and he had a one night stand and got the girl pregnant. We found out after we were back together and his daughter is now like 5 months old. He's still dealing with court to get custody, the mom is a legit psycho and won't let him see the baby. He's seen her like a handful of times.

Throughout everything (even before I got pregnant, I'm 26 weeks now) his mom turned crazy. Like seriously stresses me out. Well since she hasn't been in her first grandchilds life, she is being extra pushy in my pregnancy. But in a rude way. She won't respect any of my wishes, and simple requests (constantly gets into arguments with me about how she HAS to know the gender. And still smokes inside her house, even though I asked them to stop 3 months ago)

And now this weekend she called me after drinking saying how his daughter is my daughter and I'm her mom and I'm not doing enough to see her and insinuating that I'm not allowed to talk about or be excited about my own baby because "I have a daughter already born and I need to pay attention to her" and saying that it's my fault that she doesn't have a good relationship with her son anymore

I really don't want to keep her away from another grand child, but the way she's acting makes me feel uncomfortable with her being alone with my baby. I don't even want to tell her or his family when I go into labor and I don't want them at the hospital, because they stress me out way too much.

Anyone else have in laws that they used to love and now can't stand? I don't even know what to do!