This does relate a little to the thread, "What do you do with all the photographs?"
http://forum.portraitartist.com/show...&threadid=1105
and is an excellent example of how important (I think) it is to have the parent participate early on. Without that input, you or I might have chosen an entirely different set of images, great for painting, but not reflecting the mother's sense of dynamics in the relationship among the kids. Once you have more than one subject in a painting, IMO you have to deal the relationship, otherwisde you're better off doing a pair of singles.
p.s. Actually I'm just in it for the cake.