Jacobus Hercules was die seun van Johannes Petrus Nel en Cecilia Johanna du Preez.
(http://www.eggsa.org/documents/main.php?g2_itemId=7663)
(http://www.eggsa.org/documents/main.php?g2_itemId=7667)
(http://www.eggsa.org/documents/main.php?g2_itemId=7670)
(http://www.eggsa.org/documents/main.php?g2_itemId=7673)