Minor + Stolen account

Okay so...

I have a subreddit with a couple people I know. The 2 mods above me are never really around and have given me their trust in running the sub, which I've done ever since: dealing with people, getting new mods, approving and deleting posts. I never really bothered changing the mod order cuz I didn't really think it was necessary and I didn't know that you could do that..

But now the founder of the sub their account got stolen and is being used by a minor (under 13) whilst the sub is about a 18+ show...

And I can't get a hold of the other moderator

Any help?