You need to have an experienced matrimonial attorney represent you, this is not some thing that you can do on your own. Law is complex and this is a very emotionally charged issue for you. Without knowing all the facts and background, no one can give you any more definitive answers. Good luck!
Without meeting with you, and knowing all the facts and circumstances of your case, my opinion is not to be construed as legal advice, just general educational information.
I agree that you need an experienced attorney handling this. As you say that the judge had already issued a ruling regarding babysitting by your mother, it would appear that the thing to do is to file a motion to enforce litigant's rights.
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What an awful situation for you, your mom and your son. I really wish I could give you a better answer than this, but the truth is that you need to sit with an attorney so you can bring copies of all court orders and explain this in more detail. That should steer you in the right direction. Good luck!
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