A tenant can evict a family member from your rental property if the person is an adult (18 years). Such a tenant must still observe the legal steps of the eviction process just like you would do as a landlord. Eviction laws about evicting a family member vary from State to State based on whether the family member is not on the lease or is a subtenant. You should advise your tenant to check on those laws so as to have an easier eviction process.