Actually a lot of the games aimed at children have done slightly better on the XO than PS4, I think probably due to a brand loyalty hold over from those children's first console's being the 360, meaning when this gen rolled around they simply wanted a new Xbox regardless of any other factors.
"Kids games" isn't really a genre, they sell differently depending on the type of game it is, Lego seems to appeal to PS kids while Skylanders appeals more to XB kids, don't ask me why because I haven't played either. A blanket "kids games" doesn't really tell you anything.
The Wii U is where they consistently do better regardless of genre.