Any answer to a question like this depends on the laws in your area and your lease. Itu2019s also not clear if youu2019re renting to someone and they have a relative staying there or if you are renting an apartment (or house) and have a relative staying with you that you want to kick out. Without clarity, itu2019s confusing.If youu2019re the landlord, check the lease. When I have been (and Iu2019ll be doing it again) a landlord, then I make sure the lease specifies that ALL adults living in the unit must be on the lease. You may have wording like that in the lease. Or there might be laws in your area with a similar requirement. For some companies, they make it a company policy. (For everyoneu2019s sake, itu2019s best all adults living in a rental unit be on the lease.) I had several times where I knew someone was living in a unit and not on the lease. I explained to the tenants they could either have that person come in, fill out an application, and they could all sign a new lease so everyone was included or the other person would have to go.Usually they had no problem and would just have them apply and get on the lease. I never had someone say, u201cIu2019ll ask them to leave.u201dIf youu2019re renting a place and want to get rid of a relative who has moved in with you, again, check the lease and local laws. The landlord may insist they move out if theyu2019re not on the lease.If, however, in either case, local laws donu2019t help and the lease doesnu2019t make any specifications about whether adult residents must be on the lease, you donu2019t have any legal tool (that Iu2019m aware of) that you can use to get them out.