I hope the child's nana and papa are stable and good role models. Having bipolar disorder isn't the end of the world, though I do know a friend who was diagnosed with it and really has borderline personality disorder, so you might want to consider that. It sounds like you went through a lot and your family is quite an unconventional one. Unconventional being an understatement, more like dysfunctional.

So, your mother suffers from depression.
your father married your grandmother, and his anti social behaviors landed him in jail.
your grandfather was abusive.
Your current boyfriend has several disorders (ptsd, paranoia, rage, bipolar disorder - it actually sounds like he might turn out to be abusive, be careful with this one.)

So where is the stability in all of this? That's what I want to know. Where are you going to find that stability to model after and become more stable? Does your child have a model of stability to model herself after?