Looking for Great Grandparents Smit Jacob

Hi there, I'm looking for the ancestors of JACOB SMIT MARRIED to ZACHARIA MARAIS Jacob came to South Africa from the Nederlands (I think) more or less in 1830/1850 According to what I know they had one son Abraham * 7.7.1850 died 1922 Abraham had 8 children I have there information I need the birth dates of Jacob & Zacharia plus there ancestors if any body out there can help please Have a nice day Marie