If we designate vertex \(f\) as the root, then \(e\text{,}\) \(h\text{,}\) and \(i\) are the children of \(f\text{,}\) and are siblings of each other. Among the other things we cay say are that \(a\) is a child of \(c\text{,}\) and a descendant of \(f\text{.}\) The vertex \(g\) is a descendant of \(f\text{,}\) in fact, is a grandchild of \(f\text{.}\) Vertices \(g\) and \(d\) are siblings, since they have the common parent \(e\text{.}\)
in-context