Declare her mentally incompetent and then take control of all of her money.
I would start with a paternity test.
“Declare her mentally incompetent and then take control of all of her money.”
While that might or might not work, this issue for this man is he really wants nothing to do with his mother, so your plan would not solve that problem for him. We can only assume the mother has no “attachable” assets or they would have gotten a judgement against her.