Thank you for the opportunity to assist you.
Q) What should we do?
If your brother has not already spoken to the cops about the facts of the case or what happened, HE SHOULD NOT SAY ANYTHING. There's a reason we have a 5th amendment right to remain silent. He should definitely stay silent and assert his 5th amendment right. If he HAS already talked to the cops, tell him to not say another word.
By the way, you don't to have to talk to the cops, either. You may not have a 5th amendment right in this situation, per se, but I wouldn't talk to them if I were you. It's rare that talking to the cops produces anything positive in this type situation.
He should also retain an attorney as soon as possible. Either of these charges carries possible jail time, and an attorney will be crucial in getting him the best result achievable under the facts. If he cannot afford an attorney, after being charged he'll go to court
and he can ask for an attorney to be appointed to represent him.
I hope my response has been helpful. If you have follow-up questions or concerns on this topic, please ask. I'll get back to you as quickly as I can, although I may not be online at the moment you respond.
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Best wishes to you,