If they were on the lease, the would only have to move if they were evicted, too. Each person on a lease must be made part of the eviction action if they are to be evicted.If there were not on the lease with the landlord, however--that is, they are either "guests" of yours (people, like a parent, sibling, significant other, adult child, etc. whom you let live with you) or even a subtenant of yours (someone renting some space from you, rather than directly from the landlord), then yes, they'd have to move if you were the only person on the lease. That's because if you were the only one on the lease and you are evicted, then there is no one there who can legally give them the right to stay.