Tos comes from the well-known Chirathivat clan. His grandfather, Tiang, was a member of Thailand’s commercially prominent Thai-Chinese community and founded the Central Group in 1947.[6] His father, Samrit, served as chairman of the Central Group for 21 years and opened the first shopping center in Thailand in 1957.[1][3] Tos, born in 1965, is the youngest of eight children. Growing up, he was very quiet and considered designing cars as a profession.[3] He and his close-knit family lived on a 12-house compound in Bangkok.[6] He and his wife Sookta have two sons .[3]