Let's get the facts straight and find out. First, Support worksheet to see if she supports him. If she is flying him around the world on fabulous vacations and paying for things, she could support him.
Once you know if she supports him, then you can move to can she claim him. Use this short, anonymous, online IRS quiz, Whom May I Claim as a Dependent?
She won't get stimulus money for him since he is over 17. He would have gotten stimulus money if he had filed his own return. That is a big difference, $1,200. Please see Impact Payment Calculator.
He can file an amended return and claim himself, the IRS will send him a stimulus check later and a letter to his mom wanting their money back.
I don't know who is claiming your child, he would get Earned Income Credit and Child Dependent Credit on his income if he was claiming the child.
Good luck!
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