Nix, how the rifle fits each of yer young uns will also play a role. Your listing appears generally correct but if a rifle does not fit the shooter, even some of the "lighter" calibers can feel like bruisers to shoot. As noted earlier, some kids don't mind recoil others intensely dislike it so there are a lot of subjective factors you may want to consider. If you do run into a problem, read the following.
I was in a similar situation awhile back with my son. I got him a 7-08 thinking it was a good deer round without him risking loose dental work at the range in a 7 lb scoped rig. Au contraire, darn thing makes my 30-06 feel positively timid given the stock contour plus the lad refused to practice with it. Got him one of the PAST recoil shields. Now he thinks it is a lot of fun to shoot through an entire box. There are also some very good recoil pads though they are bit pricier with installation figured in.