The phylogenetic group comprises organisms or descendants which share a common ancestor.
A common example of the same is the children of the same family come under the same phylogenetic group.
It includes the organisms which share the common evolutionary line.
The phylogenetic relationship is shown in terms of a phylogenetic tree.
It is a tree diagram depicting in what ways a taxon is related to another and the connections between all groups of organisms can be understood by ancestor/descendent relationships.