Glagla:
Now that would be an interesting challenge - to line up as many generations as possible for one massive spanking. Or time travel to spank even more generations, or.... I think I have to try to write this!
Here's one that might take some thought, a scene where the mother and father have spanked their teenaged son and daughter, when they really shouldn't have, and it's not the first time. So the kids turn the tales on their parents and give them a taste of their own medicine.
I think this has been done here, not sure who it was, but it was son, daughter giving their overbearing mother her comeuppance.