The Izumi family is Konata Izumi's family. The family includes little members which makes it the second smallest family seen in the anime. Konata's original family includes her father and mother, although she just lives with her father only since her mother died when she was just a baby. They live in their own home, which is located in Satte-Shi.
- Yuki Kobayakawa (mentioned only briefly in Volume 3, mother of Yutaka)