According to the Legal Information Institute of Cornell University Law School, a written notice that the family member's tenancy is ending must be served to evict him or her. If the family member does not move after receiving the notice, a lawsuit may be able to be filed against the person for unlawful tenancy.
The exact type of termination notice required varies based on state regulations. A family member that needs to be evicted no matter what the circumstances should be served with an "unconditional quit" notice. If the family member refuses to leave, even after the landlord has obtained a court judgment, a law enforcement officer can remove the person.
Under no circumstances should a landlord lock a family member out or remove his or her possessions. This is against the law, and it provides grounds for the family member to sue.