Generations of the Ong family played a prominent role for the Hokkien community in Sarawak. His great-grandfather Ong Ewe Hai was a prominent Kapitan China to the Hokkien community of Sarawak, and a successful businessman in multiple fields. His grandfather, Ong Tiang Swee was Kapitan China, and also President of the Chinese Chamber of Commerce. His father, Ong Kwan Hin was also Kapitan China. Both Ong Tiang Swee and Ong Kwan Hin were the first two Chinese people nominated to the Sarawak Council Negri (Legislative Council) in 1937.