Legal Question in Real Estate Law in Missouri

If they have an understanding or contract, he may be entitled to whatever that is. If your mothers Will is probated, there may be something for him there. Ament those two things, he woo be a tenant, and entitled to what any tenant is.

Good luck

If your Mother named the boyfriend to take the property under a Beneficiary Deed, properly made and recorded, he would own the property upon her death. You can check with the Recorder of deed's office in the county where the property is located. If she bequeathes the property to him under her Will, he will probably receive the property through the Probate proceedings. Otherwise, he does not have any claim to the ownership of the property simply because he has lived there for twenty years. He may have other claims, and he might try to make a claim, but from the facts in your question, I do not believe he will succeed.