Those are darned good questions. I have a large and growing family, and the original house on our property was built as a standard tiny cookie-cutter California ranch back in the 50’s. We have a lot of land, so instead of adding to the main house, we’ve added outbuildings on the property. The office is a separate building, as is the guesthouse my eldest daughter lives in (actually an old manufactured home that I bought used and plopped down in the south 40.) The boys sleep in a rustic bunkhouse right next to the main house. There are also three sheds and a barn. It’s all just sprung up organically over the ten years we’ve lived here. Stylistically, it’s all over the place. I wish there had been more design, but mostly it was fast builds with what we could get to solve immediate needs.
It sounds odd, but it suits our needs perfectly. It probably wouldn’t work anywhere except southern California. Our biggest problem is plumbing. But it’s mostly boys, so we manage.