<human>: Can you condense the text into a few key points?

My great aunt is currently 72 years old and lives by herself (sorta) in my great grandparents' old house which she inherited many years ago. She is devoutly christian and believes that anyone else who is christian could not possibly be evil or have unholy intentions. This is where things get kinda awkward and I could use some help. My aunt met a homeless man at church recently and has allowed this man to stay at her house; not just until he gets back on his feet, but permanently. No paperwork has been filled out because my aunt does not believe in the legal system, as she believes that god will protect her. The house legally belongs to her as well as 2 of her sisters (still alive), one being my grandmother. My grandmother is concerned that when my aunt passes away, the homeless man will not leave the house. I guess my main question is for those familiar with the legal system. Could this homeless man legally stay in the house after my aunts death? Could this man ever potentially take ownership of the house if my aunt gives him ownership in her will? My grandma says that this man is just using my aunt and he may be growing too comfortable. It has been almost a year since he moved in. If there are any important details that I am missing feel free to ask and I will try to fill you all in asap. My whole family (minus the christian aunt) is at my house right now and they are very thankful that reddit could answer some questions that have been bothering them so much.  Sorry if there are a lot of grammatical errors; I am texting this from my phone.
<bot>: my really christian aunt is letting a homeless man from church stay at my great grandparents' house. She is going to die soon, what will happen with the homeless guy?