Primary

• Kotoko Aihara Daughter of Shigeo Aihara
• Kotoko Aihara Wife of Naoki Irie
• Kotoko Aihara Sister-in-law of Yuuki Irie
• Kotoko Aihara Mother of Kotomi Irie

Extended

• Shigeo Aihara Father of Kotoko Aihara
• Shigeo Aihara Father-in-law of Naoki Irie
• Yuuki Irie Brother of Naoki Irie
• Yuuki Irie Son of Noriko Irie
• Yuuki Irie Brother-in-law of Kotoko Aihara
• Naoki Irie Brother of Yuuki Irie
• Naoki Irie Son of Noriko Irie
• Naoki Irie Husband of Kotoko Aihara
• Naoki Irie son-in-law of Shigeo Aihara
• Naoki Irie Father of Kotomi Irie
• Kotomi Irie Daughter of Naoki Irie
• Kotomi Irie Daughter of Kotoko Aihara