Fostermamas (see blog entry below) also mentioned that their family is multi-generational and multiracial. And on June 27th, Annette wrote a blog response, "Regarding ethnic diversity, what are the statistics?"
The best size and number of households seems to be one of the big challenges facing cohousing in America. Cohousing communities in Europe have shown over and again that the optimum size is not too big and not too small.
Create a community that is too big and an institutional feel and sensibility will result. Create a community that is too small, and it will become more like a large family, not a neighborhood of actively engaged households.