Good question. One reason I'm debating about moving him back out of this house, rather than maybe putting in a kitchenette and laundry upstairs as an "in-law suite," is my lack of trust in what he might do with his electronics addiction. Had enough D-Days already. And it is just plain hard to do IHS for endless days, as everyone here says.
At least a camper would be somewhere on my property, so if that was going on, some visitors could be considered trespassers. Depends who it is; the local farmer guys, no problem. They often come by my house heading to the barn shop, to get his help on their machinery down the road from here. He loves being the fix-it guy for everybody. One reason he doesn't want to move.
In 2020, on my last D-Day (discovering him porn watching on a burner phone that he swore he didn't have) I ordered him out of my house that same night. At my suggestion, he pulled our old camper up to the front yard and spent the next 6 months sleeping in it, and using one of my bathrooms every night. (That D-Day happened just 3 days prior to his going to closing on the sale of HIS house, so at that moment, he had nowhere else to go. Despite me telling him for 6 years that if he lied again about his SA or finances, he was outta my house the same day. So that happened, inconvenient as it was for everyone.)
But 5 months later, the winter winds were fierce and he complained the small camper roof was rumbling, keeping him awake, and the ice on the aluminum walk plank from the camper door to my front door was also a hazard. I didn't want him or anybody to get hurt, so I put up a handrail for safety, but eventually I took pity on the whole stupid situation and set him up in what had been a small upstairs sitting room with a half bath, and this is where he has slept every night for the last 4.5 years! Plus the camper wasn't an asset to the look of the house, even though it is not visible from the public road.
Thinking more deeply about a new house across the road for him, now I'm guessing we'd need to already be Divorced and have done the land swap on those lots prior to him building on what would become his own lot. After Bigger's post, it occurred to me that any lender would ask to see his tax returns for the last 3 years, and due to our accountant in 2020 urging us to file jointly (just to lower his huge capital gains hit from his sale) and because every year since then, she keeps preparing a joint tax return for his business and my retirement income, at the very least I'd need to stop allowing that again, some time before he'd be able to borrow money to build on his own. And putting the bigger camper over there would not fly with the county, due to those lots having been re-zoned Residential.
It does help me to talk all this out, thanks!!!