Your kids will both be in the lab at ages 4 & 7, even though 2 different groups. They will always let the older go down, but never the younger up unless they are within 1 month of the next age group. The programming is so specific, they will have a blast and will nit miss each other. Unlike other cruiselines, DCL is like going to summer camp for them. Very age specic. Very structured. So I would not suggest to the Crew Members to make your older child come down with the babies, this will ruin his vacation. Trust me after 3 DCL cruises, I can swear this to you. They help the kids make peer friends and they do well just like school.