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- Wife:
- Datin Choo Lay Lian
- Sons:
- Oon Jin Leong, PJK (deceased)
Oon Jin Aik
- Daughters-in-law:
- Dato’ Loo Lee Lian
Wan Wei Har
- Daughter:
- Oon Su Lin
- Son-in-law:
- John Beazley
- Grandsons:
- Oon Jia Jee
Oon Jia Hearn
- Granddaughter:
- Oon Hui Jen
- Brothers:
- Oon Chong Kheh
Oon Chong Lew (deceased)
Oon Chong Khoon
- Sisters-in-law:
- Theresa Chong (deceased)
Dr. Therese Lim (deceased)
Doris Tan
- Sisters:
- Oon Lye Hoe
Oon Juan Geok (deceased)
Dr. Oon Hong Geok
- Brothers-in-law:
- -
Lim Poh Eam (deceased)
Dr. Tan Seng Giaw
nephews, nieces & a host of relatives and friends to mourn their loss.