child node (of a tree)

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A child node $C$ of a node $P$ in a tree is any node connected to $P$ which has a path distance from the root node $R$ which is one greater than the path distance between $P$ and $R$ .

Drawn in the canonical root-at-top manner, a child node of a node $P$ in a tree is simply any node immediately below $P$ which is connected to it.

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Figure: A node (blue) and its children (red.)