I agree with the other replies you shouldn't tell your son to keep it to himself, if he's proud of it then let him boast about it.
Hiding the fact or having him keep it as a secret may make it seem like there are reasons to keep it on the down low and there aren't any reasons,
so I say let him Boast with Pride.
Democracy is two wolves and a lamb voting on what to have for lunch.
Liberty is a well-armed lamb contesting the outcome of the vote.