Oh Willow!!! You must have had a great Christmas morning with those little ones!! They are just so cute..
Don't know if this will work for you, (we only have our one son), but we have always had a daily list of things he had to do before he could do any things else. Once they were checked off, he could go have fun.
When he was little it was only one or two things....like pick toys up off floor and brush teeth. As he got older we would add another, like dust his room, run sweeper, take his clothes to laundry room....etc. Believe me it works.
When we first started using this "chore list" he might not want to do any of it so would plop himself down in front of the TV. WRONG! If he didn't want to do his chores, all he could do was sit on the couch...no TV. After a few times of trying to show us "he" was boss, he learned "we" were....LOL He doesn't really have the list anymore, but knows what has to be done before he can watch TV, play his video games...etc., so now he just does it.