Just share is the fastest way to end a sibling fight and one of the least useful things to say if the goal is actually teaching kids how to resolve conflict. It ends the noise. It doesn't teach the skill.
What sharing on command actually teaches
When an adult resolves the fight by picking who gets the toy, or forcing an even split, kids learn that conflict gets solved by an outside authority stepping in, not by working it out together. That's a fine short-term fix and a poor long-term lesson, since the sibling relationship is one of the only places kids get to practice conflict resolution with someone who isn't going anywhere.
What compromise actually requires
Real compromise means both people say what they actually want, and both people give something up. That's a much harder skill than sharing, and it's rarely modeled well, because most adult compromises happen quietly, behind closed doors, where a kid can't see the process.
Two brothers, one boat
JimBob, one of the Schnerds characters, is written as two fraternal twin fish sharing a single body, which forces the compromise question constantly, and not always gracefully. The story doesn't pretend they always land on a clean fifty-fifty split. Sometimes one of them just gets more of what he wants that day, and they live with it.
A better question than share
What does each of you actually want here takes longer than just share, and it's the question that actually builds the skill instead of just ending the noise for now.
