Safety Dispute with Room mates - valid reason to break lease?

I am pressing charges on my room mate's father for harassment, trespassing, and endangering the welfare of a minor. He is not on the lease, and I am fearing the safety of myself, my guests, and my visiting family. Since my room mate and her father are creating a hostile environment, can I legally break my lease? There are two other occupants who have signed the lease. If I give my 30 days notice to both room mates and the landlord, does that release me from the lease since there are other cosigners? Or can I still be held accountable for the remainder of the lease or until they get a new room mate?

Or should I offer to help find another room mate for a lease assignment?

Also, the room mate in question also brought a pet into the house, and she keeps it in her room. We do NOT live in a pet friendly apartment, and I do not want to be responsible for the pet when it comes to the lease. What can I do? Does this release me from the lease since my room mate has already broken it if the landlord finds out?

This is in the state of North Carolina, by the way.

What has the roommate and his/her father done to constitute harassment? Get a restaining order if necessary. This does not give you just cause to break the lease. The LL has done nothing wrong and you may not injure the LL (monetarily) for something out of his control. This is a dispute between roomates and has nothing to do with the LL.

If you wish to not be held accountable for the unauthorized pet, let the LL know that the roommate has a pet and that you have no part in it. That you do not concode the pet being there and you do not wich to be held responsible for any damages from it. Any damages from the pet will still come from the joint deposit. But you can sue the roommate for those damages if they do not agree to have that amount subtracted from their share of the deposit at move out.