Primary

• Seto Kaiba Adoptive brother of Noah Kaiba
• Seto Kaiba Older Brother of Mokuba Kaiba
• Seto Kaiba Adopted son of Gozaburo Kaiba

Extended

• Mokuba Kaiba Younger Brother of Seto Kaiba
• Mokuba Kaiba Adoptive brother of Noah Kaiba
• Mokuba Kaiba Adopted son of Gozaburo Kaiba
• Noah Kaiba Son of Gozaburo Kaiba
• Gozaburo Kaiba Father of Noah Kaiba
• Gozaburo Kaiba Adoptive father of Seto Kaiba
• Gozaburo Kaiba Adoptive father of Mokuba Kaiba