@bjadams : I'm going to check the families problem. Does it happens when you have several Sprites in a Family, and one of them has the behavior, or all of them ?
By the way, what kind of coloring book are you doing ? I don't know if you saw it, but I gave some code to R0j0Hound to integrate the "floodfill" ('paintbucket') in the Canvas plugin. With that, you can colorize black & white images with color where you put your finger.
(My question : your "anxious little kid", is it your inner child, or your real child ?