Primary

• Shigeo Aihara Father of Kotoko Aihara
• Shigeo Aihara Father-in-law of Naoki Irie

Extended

• 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
• 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