五华县
Tsang was born in Wuhua County, Guangdong, China on 7 October 1943, the son of Tsang Kwok Ying (1906–1999), District Minister of Tsung Tsin Mission (formerly Basle Mission) of Hong Kong, and Wong Kun Tsing (1916–2014), a devout Christian committed to the church and family. They moved to Hong Kong when he was two years old. Today he and his wife Tse Wai Yee live in Hong Kong. They have two sons, Tze Yee and Tze Yan.