can parents legally withdrawal all of your savings? im asking for a loved one, and his parents proceeded to take $5000 from his account for no reason.

Due to current events of protesting, my boyfriends parents have taken every penny out of his savings for no clear reason. It happened earlier today and they dont seem like they will be giving it back any time soon. Not all of the money is from him but he has put a little bit of his own money into the account and is now left with nothing. There has to be some legal action to take. He is 19 almost 20 yrs old