I couldn't IMAGINE trying to take care of 11 special-needs kids. With our one little guy, it came so close to tearing our family apart (we already had two birth children), we almost didn't go through with the adoption. We're glad we did, but it was real iffy there for a few months.
I couldn't take care of one, but it sounds (from this story) that these folks found a way to successfully take care of 11.
Remember these kids go to therapies and day care during the days. There is a lot of programming for MR kids.