As for your children "seeing you on the machine" - well, if you think about it, there really isn't much to see. A machine with a couple of red tubes leading to you, and a couple of other wonky things sticking out. What they will see is your attitude. If you are casual about being on the machine - this is something Mom needs to do to stay healthy, it isn't scary, it doesn't hurt, Mom is fine while she's on the machine - then that is what they will see. You could even set aside some special time with the kids while dialyzing - watch a movie, play a game, work on homework, or something else age-appropriate. I think 11 is certainly old enough to understand what's going on.