Four-Up! It is so hard to catch these multiple riders because number 3 is usually hidden behind number 2 and you don’t know you’ve got four-up until they pass. I’ve even seen five-up when the kid in front is smaller and Mom is carrying an infant.
So 1) Dad says look! someone is taking our picture! 2) Dad waves the girl’s hand and the boy gives off the V. 3) but wait! I’ll take your picture too! 4) And they’re off.