Three of Raphi Phattanasak's father's parents are unknown, but his maternal grandfather is Phraya Breja Bijaya (Noo Keutat).
Paternal Grandfather:
Mongkut, King Rama IV of Siam Paternal Grandmother:
Queen Debsirindra Maternal Grandfather:
Phraya Viangnai Narubal
(Rhung Ketutat) Maternal Grandmother:
unknown 
