My solution was to rescale the bodies of both children to the size of the P4 female. I then resaved the characters in the library and renamed the CR2 files as Melonhead (the rescaled figure with the big head) and Pumpkinhead (the rescaled figure with the REALLY big head). This method works much better visually than turning off the visibility options for Vicky's shins, feet, and toes (then parenting the sneakers to her knees) and adjusting the Y-trans so that she doesn't tower over the P4 Male. Additionally, both methods seem to draw attention away from the general dorkiness of the P4 male