Emeritus Senior Minister Goh Chok Tong and his wife Tan Choo Leng have a pair of twins, Dr Goh Jin Hian and his sister Jin Theng, both 49 years old.
When talking to ST in 2005, Dr Goh Jin Hian described his parents as "hands off" with him and his sister, who now lives in London.
He added that his parents "would tell us, it's okay if you don't want to study, so long as you're sure that's where you want to end up. It's up to you what you want to be in life."