Well from the behavior you described, I'm thinking that his ex wife should present it to the court that he has some questionable behavior and let them investigate. If he is leaving guns and knives laying around that is a concern. I know that some people are verbally abusive to a spouse but not to the child, but if the child is witnessing the abuse that can be considered abuse, too.

So from those things, I think she has a reason to be concerned. But those are things that have nothing to do with bipolar necessarily, and everything to do with being abusive.

Also, it will depend on his visitation rights whether he can take the child from day care. Taking a child from daycare isn't a concern if it is a legal gaurdian necessarily, unless it's a constant issue or there is a threat of that person taking the child and running.