Can a landlord terminate a lease early?

My son who is autistic lives in a private home with 2 roommates. The home is owned by the parents of one of his roommates. My son has lived there for 13 years. We have never been late with the rent. 1. Can Landlord end the lease early? We are currently in the middle of the year to year lease . 2. Can I hold the Guardians of the roommate liable for their son assaulting my son? Thank you for your review and direction in this matter.
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