With his twin sister Natalia, the two were born to Judith and Simon Horton in Wales, on the 26th of September 2000. 3 weeks after they were born, Simon divorced Judith. After the divorce, Judith legally changed his name to "Nathaniel George Arthur Williams".
At the age of 7, the family moved to Ireland. When the twins were 10 the family moved to Dibley. Neither Judith nor Geraldine had any idea that either of them had to do with Simon, so the family was welcomed into Dibley. They attended boarding school in Ireland but were schooled alongside the village children when they moved to Dibley. Nathaniel has met his biological father, whom wasn't very interested in him, nor was he interested in Simon. Nathaniel has a better relationship, instead with his uncle and cousin.