Primary

• Yoshihiro Otsu Older brother of Mari Otsu
• Yoshihiro Otsu Son of Makoto Otsu
• Yoshihiro Otsu Grandson of Ema Otsu

Extended

• Mari Otsu Daughter of Makoto Otsu
• Mari Otsu Granddaughter of Ema Otsu
• Mari Otsu Younger sister of Yoshihiro Otsu
• Makoto Otsu Father of Yoshihiro Otsu
• Makoto Otsu Father of Mari Otsu
• Makoto Otsu Son of Ema Otsu
• Ema Otsu Grandmother of Mari Otsu
• Ema Otsu Grandmother of Yoshihiro Otsu
• Ema Otsu Mother of Makoto Otsu