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I am sorry to hear about this situation. I am going to assume you never agreed that he would pay you rent. If you did agree (verbally or otherwise) reply and let me know, as my answer would then be different.
He is what is known as a tenant at sufferance. A tenant at sufferance is someone who has no right to occupy the premises, but is tolerated by the owner and may be terminated at the will of the owner.
A tenant at sufferance has few rights, but one of these rights is to be evicted. So in other words, one cannot simply physically kick him out of the home. He must be evicted like a tenant who has not paid rent. If after the quick eviction hearing he still does not leave, then, one can get a Writ and have the authorities forcibly relocate him.
However, many tenants at sufferance simply LEAVE once they are given notice that they will be evicted if they do not, since they have really no defense to an eviction.
So here, you may:
1) Give him notice to leave (KS does not specify how long for tenancy at sufferance, so 15-30 days is best) and if she does not;
2) Evict him as though you would a tenant; and
3) Have the authorities remove him by force if he still does not leave; and
4) Change the locks.
Again, the majority of tenants at sufferance shall leave upon notice, or shortly after an eviction is filed.
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