I just found out that here in GA, no THIRD PARTIES are allowed in any court hearings. The case manager stated that it causes way too much caios....
Good deal. One less thing to worry about.
If I were in your position, here is what I would do:
Ignore the wife. She's nothing. Don't be ugly. Don't be anything. Act as though she doesn't exist.
Inform your ex one more time, nicely but firmly, that until the baby is fully receovered from his infection, that YOUR EX is more than welcome to come visit his son at your house. His wife is not welcome in your home. Period. You do not need to justify anything to him.
After that, ignore him as well. If he wants to make arrangements to come see baby, great. If he starts in about the wife coming, too, end the conversation, telling him that you have already stated your position on this and will not do so again.
If he choses not to come see his baby because his wife can't come, so be it. Keep a diary and document conversations. You never know when you might need it. Keep taking the high road on this.
All you can do is keep on keeping on. As long as you continue to act like the adult here, the only one who will look bad is your ex.
Let him know that when your son is fully recovered from his infection, he is welcome to pick him and visit with him in his home, with his wife there.
Hang in there. From my past experiences, it will get better.