Sarima's sisters are named Two, Three, Four, Five and Six (Sarima is the eldest and would technically be One) and they are present in the fourth section of Wicked: The Life and Times of the Wicked Witch of the West, In the Vinkus.
Sometime prior to their appearance, the five sisters joined Sarima at Kiamo Ko when she married Fiyero in order to have a better life. For reasons unknown, Sarima's widowhood forces them to remain unmarried, which causes them to secretly resent her. However, they do seem to love her, as they will not hear the truth of Fiyero's death out of loyalty to her. They do most of the work in the castle and are even servants to Sarima. When Commander Cherrystone arrives, they attempt to match him up with Sarima, as a remarriage would allow them to finally marry. They put many of their hopes into Manek becoming the next Prince, and are thus devastated by his death. They are taken by Cherrystone's forces, and are apparently killed by an unknown assassin.