Hi Linda, We just ran Yarmony on Sat. and it was high and fast. I understand a commercial raft flipped and I know we talked to some very experienced rafters who threw people out on that stretch. I loved it, but I personally would choose another run if I had kids, at least until it comes down. Call me over cautious, but I don't think you can be with kids.
We float either Grizzly or Roaring Fork to South Canyon almost every weekend and that's a good family float. It is high again this week, so Maintanance Shed in the G. Canyon is punchy, and the wave train in South Canyon is big, but if you stay straight you and the kids will have a great time!