We share a home with my mom and I love it. It has its moments, but for the most part, it's awesome. When I was 21, I was struggling to pay rent in a house I shared with a roommate so when my parents moved to a new house, they invited me to come live with them and save up some money. So I moved in at 21 and got pregnant within a few months at the age of 22. Whew! We just stayed here and all of my children have been raised by Dh and I plus their grandparents. My dad died almost 4 years ago and while it was hard for the kids, I'm so thankful that they had an extremely close relationship with him. He used to play board games with Ds, look under the microscope with Dd and when Dd2 was tired, she'd go take a nap with grandpa - so sweet.
My dream is to move to a big chunk of land and to have 2-3 homes on it. My mom, sister, and our family have been talking about this for a few years now. I think it would take a lot of pressure off of each of us if we all chipped in. Plus, as my mom turns 70 next month, we'd remain close to her to help her as she ages. Not to mention how much all of the grand kids adore her and she, them! My dream includes BIG family dinners at a great big handmade table. I know my sister and I would have our moments, but I think there would be way more positive than negative moments.
metasequoia - you sound like me, I would've lived with my parents forever. DH and I were totally compatible with them as adults and we did live with them from time to time but it was to help them out as they had sicknesses and eventually when they died. The biggest thing for me was making sure they were never alone or needing for anything.
I love your setup and your dream... it sounds really nice and very supportive overall. Family values like that are not nearly common enough these days!