Basic Tree Concept: Defining ancestors

F, C, A are ancestors of H cause there exists a path from root A to node H and nodes F, C, A appear in the path. node H is called descendant of nodes F, C and A.

E is not an ancestor of H. It's an uncle because it's a sibling of F, which is the parent of H.

F,C,A are ancestors of H. That's true.

G is not relevant to H at all.

Tree structure relationship notation can be found here (according to Wikipedia)

• A node's "parent" is a node one step higher in the hierarchy (i.e. closer to the root node) and lying on the same branch.
• "Sibling" ("brother" or "sister") nodes share the same parent node.
• A node's "uncles" are siblings of that node's parent.
• A node that is connected to all lower-level nodes is called an "ancestor". The connected lower-level nodes are "descendants" of the ancestor node.