My name is XXXXX XXXXX I'd be happy to answer your questions today. I'm sorry to hear that this happened.
The law protects victims of domestic violence, and the statute applies whenever certain crimes are committed against a household member. That includes burglary, intimidation, stalking or harassment. It also includes conspiracy to commit murder, but I don't know if this is an actual plan or just threats. Your grandson may have grounds to get a restraining order against the roommates, in which case the landlord is required to change the locks if he wants to stay. Indiana Code, Section 32-31-9
-9. If he does get a restraining order, Section 32-31-9-12 requires that a landlord let him out of the lease by providing 30 days written notice. He would be responsible for paying rent during those 30 days. The law allows the landlord to require a copy of the restraining order, which means that he may have to go to court. The landlord can also require a safety plan from a domestic violence program that recommends that he move. But you may be able to negotiate where he pays some amount and doesn't have to go through that whole process.
Your grandson can also sue the roommates for the value of the item they stole from him and sold. He can also sue them for any rent that he is required to pay after they drove him from the premises by threatening him and creating an unlivable situation.
The other option to avoid liability without going through the courts is to try to find someone to take over the lease (maybe a friend of the guys who are there now?), but I can understand how that could be difficult in this scenario.
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