I'm not sure what 'guardian ad litem' means... here in Canada, there are different types of custody (joint, sole etc.). His ex-wife flat out refused to give him a 'scriptural divorce' unless he agreed to all the terms of the agreement her lawyer drew up. That agreement stated that she had sole custody and that he had visitation rights only - but she even specified that he could only see them in HER province. He is not even allowed to bring them here which is crazy. He has always been a great father and there is absolutely no issue about that at all. She also has the kids convinced that more than one phone call with their Dad per week is too much despite the fact that he bought and pays for their cell phones.
For me, I have 50/50 joint custody of my kids but it doesn't do me much good. My ex and I agreed that we would go by the table amounts for child support which in theory is fine but any time we start talking about them living here 50% of the time he gets them all upset and freaked out and ruins any progress that I've made. In his words he 'helps them to make an informed decision' but what he's really doing is manipulating the situation and their emotions so that he has that child support money in his pocket.
I think how both of our exes have acted has been terrible. They have used the fact that we are disfellowshipped to their own advantage and brainwashed the kids.
I just hope that maybe when the kids are adults they will look back and see the truth.
A guardian ad litem is a court appointed representative for the kids only to serve their best interests. As far as your husband's divorce agreement, agreements can be revised. Since he can prove that his ex is keeping the kids fro even phone calls, he would probably have grounds to reopen the case. You should definitely check with your attorney. As for your kids, there's no way you should let your ex bully you out of your 50% custody. You let him do it, because you feel unworthy as a df'd person, but in reality you were simply kicked out of a cult, and he needs to get off hs ass and get a job.