I want to punish 1 of my kids but not the other 2, even though they all did nearly the same thing
Can you please explain why you want to punish one and not the others?
This is the first time the other two did anything like this.
As a parent, you shouldn't play favorites. Treat all your children equally.
they shouldn't be put in the same situation as the other got punished.
It is probably best you punish all three. The other two might think they can get away with that behavior if they do it again and it should be stopped before it becomes a habit.