The only children who could possibly remember that are Evan and Otto, who would have been, at most, 3 and 4. They’re unlikely to remember it, Felix definitely won’t and the triplets may or may not have even been born yet. So that’s 7 children who have never had a holiday in their life and have never been to a theme park or other experience. The elder 3 may remember trips to the zoo, solo trips to their grandparents for 1:1 holidays etc but the majority will have had none of these normal childhood experiences. At least with the first 6, the triplets were spontaneous and it was completely understandable that they’d struggle with multiples. Even then their life was more varied. The younger 4 will have the least varied experience and are all lumped into a group with no individuality and poor Felix and the triplets are almost forgotten.