There is not a good Mom in the world who would allow this, so forget it.
Any parent who consented to this would be in jeopardy of law (as your elsewhere admitted activities demonstrate). It is obvious from a review of the question asker's contributions that he has one motive in asking this question, and that one is illegal. WikiAnswers does not provide illegal advice. As this question is largely unanswerable outside of the context of the asker, this is the only answer you can receive.
Lie.
Do you trust your girlfriend? if you do then no worries pal just let her hang with them and if they really are not the greatest people then she will figure it out...
You can't but it will be the job of your girlfriend. She's the only one that can tell them to leave the two of you alone. If you did it alone without her knowledge the ex boyfriend and ex husband will make sure to make you miserable. But it sounds like your girlfriend doesn't want to deal with them both, so maybe you can try to ignore them both...
Well what I did was beg.
Tell him he needs to drop his girlfriend. If she requires that much attention and not let him hang out with his friends, then he doesn't really need her. Friends are more important than girlfriends. Girlfriends come and go, real friends remain for a lifetime.
You can inform her that someone elder (maybe your mom / dad) would be at home. That may make her believe that nothing wrong would happen.
You just beg them
You will have to go to family court if your girlfriend is allowing her family to manipulate her into keeping your child from you.
Well first let him know that you have been invited to a sleep over then be sure to let him know the name and phone number of the persons parents that you are sleeping over at. Arrange it to where he can meet the other parents.
It depends. If the parents press charges, there is a chance of legal repercussions. You should talk to your girlfriends parents and let them know. If they just find out, there is a chance they might not be as forgiving.
hold their hand more :)
It has to be at a time and place when both of you are in the mood. When are you going to be in the mood? Nobody can give you an exact time and place when it will happen. Just let your heart do the talking. The rest of your body will follow. One weak spot I've found in most of my girlfriends is their neck. Caressing their neck with my lips weakens them. It may or may not work for you.