In cladistics: The descendant branches from a node on a cladogram, the two species or higher monophyletic taxon (clades) which meet at a node; or in other words two lineages which diverged from that particular common ancestor. In a phylogeny, the descendants of an ancestor are called "daughters", while the siblings after a speciation event are called "sisters" (so a descendant is a daughter relative to its ancestor and is a sister relative to its other sibling). Note that if either of the daughters undergoes further speciation then the sister to a particular terminal taxon may actually be a group of terminal taxa. Because sister groups share a common ancestor, they are each other's closest relatives.