[1] His parents were Maria Magdalena Blankenberg and Johannes Carolus de Wet.
He married Magdalena Saria Maria Butger in July 1761, and out of their marriage one child was born.
Through the years he stayed with the DEIC and started as assistant and followed that up with a bookkeeper (1768), office manager (1772), buyer (1775) and then a member of the Council of Justice in 1778.
In the beginning of 1795, de Wet led an official commission that went to Graaff-Reinet to look into complaints by the residents against, Magistrate Honoratius Maynier .
[9] In 1772 de Wet together with the German banker Chiron, the Dutch Ships Captain van der Weijden and locals ( Brand, de Wit, le Febre, van Schoor, Gie, and Pieter Soermans) started the first Freemasonry movement in South Africa.