I can totally relate to being a Landlord after my recent venture into the cottage business. Very firm rules and boundaries with an airtight contract and decent damage deposit is absolutely necessary. Knowing you - can I suggest that you are just so nice and giving that people are taking advantage of that (and you).
The DIL's sister might be a good option but still state your "Rules" up front and be very clear.
Ashley would come and live with you in a heartbeat! She still talks about your home and you constantly. You made a great impression with her.
As for the house… Well - that was what I wanted, felt I needed from the divorce and I paid a big price for it. I was going to maintain the status quo. A few years post D and it did not matter so much. I had dug in my heels for a material possession. It was the dream house but the dream had died.
I have sold my homes twice since our split. I have not looked back. I reached a point where I could be grateful for having had the opportunity to live there but it was now the dream for someone else.
Wish we could live there. Make it a vacation home. Pay you year round but only show up for a month a year. LOL!