Mike just dropped the two younger kids off at day camp at a nearby community center, and when he returned he commented that 8-year-old Kieran immediately dives into the kids, participating in whatever they are doing or initiating a new activity. Nick hovers near the door, asking to be picked up. They did this yesterday when I dropped them off, too.
Nick has been clinging to the youngest child mantle, as well...he's almost 5 but seems so much younger than Kieran did at the same age.
One thing they do have in common, though, is their love of drama. Nick has a different costume and character every day...most of them recently seem to involve pajamas for some reason!