You can pick the family that have ID not equal the global is invisible.
I made a demo, is this what you need?
Move around with arrow keys.
Yes, it is. But I think I found a way to pull it off after experimenting a bit. So what I did was:
Keyboard => On Key Pressed => System => Add 1 to Global Number
(Sub-Event)System => Pick Family1 where Global Number = Family1.ID => Family1 => Set Visibility(visible)
(Sub-Event)System => For Each Family1 + FamilyID < Global Number => Family1 => Set Visibility(invisible)
(Sub-Event)System => MenuSelection = 4 => System => Set Global Number to 0
It seems to work after testing it out, but is it alright if you showed how you did the demo for the sake of comparison?