Bmom's parents warning against open adoption

If it were me, I would have some more conversations with her parents and not dismiss what they say. They probably have real serious reasons for warning you, but you need more info from them and possibly others who know Mom as well. They have known her a lifetime, and you have known her a few months. Anybody can be who they want you to see for a short period of time. I know a Mom who sounds similar in that she seems ok on the surface, but hides a very serious mental illness that does not become apparent until many months after placement. She has two children she does not parent(we do not have either of them). Just do more research so you are prepared.