Child and Sibling

A sibling is at the same level.
A child is as the name suggests, a child of the parent, the next level down.

Parent A (sibling of Parent B)
Child 1 of Parent A (sibling of Child 2)​
Child 2 of Parent A (sibling of Child 1)​
Parent B (sibling of Parent A)
Child 1 of Parent B​
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