Great idea about the book...

Not so sure about the plug...I know my kids would start playing around with cords if I used that example But it is a great visual about how MS works...or doesn't...

My kids were all adults when I was dxd. My 27 yr old DD has taken it hard...when we are all together, and I start walking like a drunk or something comes up suddenly, she starts crying. So I try my best not to show what's up...I try to even fool myself, just so the MonSter doesn't control my life...

Anyway, I would suggest simple terms, put in a positive light, to explain what is going on. Children are perceptive, and also fearful of losing their parents, so I would definitely let them know that you will be there for a very long time...