Popsicle
Adults may think that popsicle colors are not important, but to a kid it means everything. The color is not just a color, it’s something cool and different and needs to be eaten by the right person no matter what. Siblings often fight over stupid things like this all the time.
You would be surprised to see just how violent things can get between siblings over trivial things like who gets to eat which popsicle. We can say that with our own siblings we would argue over stupid stuff constantly and most of the time we did not get our way in the end.