My brothers and I used to fight all the time about super random things. Like the time that we got angry at each other because my brother was not in a good mood. While he was not in his best mood, he got angry at all of us in the family, and I just think that this is so unfair of him, so I told him off, and he got really mad at me.
I remember that we had a rather intense screaming match that ended finally when our parents talked to us and reminded us that we are siblings. Siblings are blood-related, and while fighting is normal, we will always have the ability to resolve our different issues in a more civil manner.