Yes, he does.
He has every right to use them to defend his person/home/freedom as anyone else. The explicit purpose of Ammendment II.
Show me a law that says a 4 year old has to sit still and die quietly in any of those cases. Now wise parents know that a 4 year old is as likely to misuse the weapon so they don't let them. But in dire circumstances I know i can hand my 12 year old and my 7 year old weapons and they have the God given right to bear those to defend against danger. No different from anyone else.
Wow.. God help you.