Yu-Gi-Oh Family
(Oh Family)

Yugi  (Student)
Yami Yugi  (Law Enforcement)
Mai  (Health)
Tristan  (Business)
Tea  (Politics)

The others live in other houses!  Click to see:
Joey (Wheeler Family)
Kaiba (Kaiba Family)
Serenity (Kaiba Family)
Mokuba (Kaiba Family)
Bakura (Bakura Family)
Yami Bakura (Bakura Family)
Pegasus (Pegasus Family)