Cornelis was born on October 4th, 1760 and his baptism took place on October 4th, 1760. Cornelis' father was Dirk Coetzee and his mother was Johanna (Anna) Elizabeth Olivier. His paternal grandparents were Cornelis Coetzee and Geertruy Gerrits. He had a sister named Cecila. He was the older of the two children. He died at the age of 82 on November 11th, 1842.