Okay, so since she was born I've had several public meetings and a few times where I've brought her to their house but stayed the whole time, and tonight I'm gonna let them have her alone for a few hours while my SO and I go out. I'm kind of nervous, but I know how much they love Emma and I think I can trust them to keep her father away from her.
Fingers crossed!
Re: Emma's going to her grandparents tonight
FYI, you could set a precident that you have allowed the LO to have overnights with grandparents therfore the father could successfully get overnight visitation granted.
I would totally slow your roll on the whole SO relationship.
She's not staying the night with them, she's only going over there for a few hours in the evening. Also I don't think he would get any unsupervised visitation granted because of his criminal background and his abusive tendencies.