Sibling rivalry is a common thing that happens all the time with siblings. There are many ways that siblings rivalry happen. Here are some ways:
Attention
attention is one of the most common ways that sibling rivalry start. The parents are giving more attention to the baby so the other child doesn't like it so they want to fight.
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Sibling Rivalry
Siblings fight all the time. They fight for many things but the most common things they fight over is toys and attention. They usually start fighting at 1-5 then they start to realize that fighting is bad and their parents start to tell them not to fight any more. They still fight but not for little things like toys and attention.