Who is the opossums closest relatives?

Opossums are most closely related to other members of the order Didelphimorphia, which includes all opossums, living and extinct. Within this group, opossums are most closely related to the family Didelphidae, which includes all living opossums. Among living opossums, the Virginia opossum (Didelphis virginiana) is the most closely related to all other living opossums.