The minute my brother told me he assumed "I got it" but I was violating his rights as a parent I would have been like ok then your son is in a taxi on his way back to you and yours then. Since you have custody until July OP just wait until then. I feel like there's nothing to be done until then. The court has spoken for now. You are the temp guardian. When July hits you withdraw your motion, tell them he wants to be with his parents maybe even tell them the parents say they want him back (because it's what they've been saying but not meaning it). Then after that it's not your problem anymore. They will have to figure it out. I'm sorry you're in this situation. Another 5 months and you should be done. Until then, if your brother is paying child support like he said you better make sure you are getting that money and not the mother.