Primary

• Suguru Kouda Older brother of Arata Kouda
• Suguru Kouda Son of Miyoshi Kouda
• Suguru Kouda Son of Masaomi Kouda

Extended

• Arata Kouda Younger brother of Suguru Kouda
• Arata Kouda Son of Masaomi Kouda
• Arata Kouda Son of Miyoshi Kouda
• Miyoshi Kouda Wife of Masaomi Kouda
• Miyoshi Kouda Mother of Arata Kouda
• Miyoshi Kouda Mother of Suguru Kouda
• Masaomi Kouda Father of Arata Kouda
• Masaomi Kouda Father of Suguru Kouda
• Masaomi Kouda Husband of Miyoshi Kouda