Primary

• Mansaku Sano Grandfather of Manjiro Sano
• Mansaku Sano Grandfather of Shinichiro Sano

Extended

• Manjiro Sano Grandson of Mansaku Sano
• Manjiro Sano Half-brother of Emma Sano
• Manjiro Sano Brother of Shinichiro Sano
• Manjiro Sano Best friend of Ken Ryuuguuji
• Shinichiro Sano Adoptive brother of Izana Kurokawa
• Shinichiro Sano Grandson of Mansaku Sano
• Shinichiro Sano Brother of Manjiro Sano
• Shinichiro Sano Half-brother of Emma Sano