Haruka and Michiru have no known parents or siblings. That doesn't mean they're totally without relatives, though. They have an adorable, sweet family that they eventually form with Meioh Setsuna, best friend and third partner, and Tomoe Hotaru, the girl they at first try to kill but whom they eventually adopt as a daughter.

• Goddess of Pluto ~ Meioh Setsuna / Sailor Pluto
• Goddess of Saturn ~ Tomoe Hotaru / Sailor Saturn
• Tetra ~ Relationship with Setsuna and Hotaru