Bmom's parents warning against open adoption

Just a few thoughts off the top of my head. Did the bmom's parents provide any specific examples? Is it possible they do not want an "outsider" adoption but rather would petition custody? Does your bmom speak of her parents or her other child(ren)? If you are working with an agency or attorney, I would be dialing them so fast the keypad would have smoke coming off of it. If not, then I would think that you would have to speak very gently with the bmom regarding the matter. To protect you and your family, it seems like you have to investigate the comments more. Is there someone else - a birth father, aunt, uncle cousin, neighbor - anyone else that you can think of that would be able to provide a neutral standpoint. Take an honest look at the relationship you have had with bmom. Has there been any situations or experiences when you thought something but pushed it under the rug or found inconsistencies with situations? I hope it turns out that the bmom parents were over-exaggerating but if they had nothing to gain from the experience, why would they provide such a comment?