Before commenting on the article:
I realized this morning that I have never, ever, rented an apartment. Weird, isn't it? But I was in a sorority in college, and then moved back home after college, originally just for a short while, but then my dad convinced me I may as well live with them until I had a downpayment for a house.
So I saved what would have been rent money and bought a condo a few years down the road.
Strictly financial.
With regards to the article:
I think what made it work was that (a) my parents realized I was an adult and (b) I realized it was their house, and that I needed to be respectful of their wishes. We had all made a choice, and part of that choice was learning how to make the arrangement pleasant and comfortable for everyone, using entirely new parameters for how we dealt with each other. It's not that easy to do; I know we all really talked it out before it was set.
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Mom to an amazing young adult AS son, plus an also amazing non-AS daughter. Most likely part of the "Broader Autism Phenotype" (some traits).