Primary

• Shintaro Oishi Father of Takumi Ooishi
• Shintaro Oishi Father of Hiroki Ooishi
• Shintaro Oishi Husband of Yukiko Ooishi

Extended

• Takumi Ooishi Younger brother of Hiroki Ooishi
• Takumi Ooishi Son of Yukiko Ooishi
• Takumi Ooishi Son of Shintaro Oishi
• Hiroki Ooishi Older brother of Takumi Ooishi
• Hiroki Ooishi Son of Shintaro Oishi
• Hiroki Ooishi Son of Yukiko Ooishi
• Yukiko Ooishi Mother of Takumi Ooishi
• Yukiko Ooishi Mother of Hiroki Ooishi
• Yukiko Ooishi Wife of Shintaro Oishi