I've lived this way my whole adult life; with my dad (when he was alive) and now in a coach house above my mom's garage behind her main house. Partially is because I've had struggles landing a job due to my autism and anxiety. If I did have a job, I would be saving my money so my best friend (who I also told to save money) can buy a house together back in my former town where we can work nearby, invest in our pinball/arcade man cave. We figure it's easier to invest in a future house while living with parents rather than being out before being ready. Besides, with the economy and housing market the way it is now, it's the only way to live and that's with parents.