Found this on a community board and well, thought it might be useful to repost. Also looking to add to this as time permits.
|Ascendant||Any object higher in the "tree", includes parent (and grandparent, great-grandparent, etc)|
|Parent||Object directly above selected object (VM's parent is a host, for example. Host parent is cluster, etc)|
|Child||Object(s) directly below selected object in the "tree" (host child(ren) is any VM on host)|
|Descendant||Any object lower in the "tree", include child, grandchild, great-grandchild etc|