I dunno. If they use the key to gain access and throw a party, they probably aren't trespassing. Their guests might be. You might have civil cause against the k

I dunno. If they use the key to gain access and throw a party, they probably aren't trespassing. Their guests might be. You might have civil cause against the kid, but if they clean up after the party and don't cause a nuisance or disturbance, there's not obviously a criminal act by the kid there. Maybe a conspiracy charge on the trespassing?