Landlord Claims Property Ownership but Never Transferred After Death of Neighbor/Owne

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...I was ok w the story until they began coming here and the man sleeping in my driveway, crossing other boundaries, like moving their things onto property etc. and causing me some stress as well as causing me some suspicion...

I don't know what else is making you uncomfortable, but the man sleeping in the driveway (I assume in a car or something)? I wonder if there's something that could be done about that, which might, through a back-door approach, result in your getting more info about the people claiming to be the owners. The police verifying that the person has a right to be on the property or something.