He grew up with his two younger brothers, Holger Marius Nielsen (1905–1993) and Povl Erik Nielsen (1909–1995) in Glostrup, 10 kilometres west of Copenhagen.
He was brought up with his two younger brothers, Holger Marius Nielsen (1905–1993) and Povl Erik Nielsen (1909–1995), in the nearby town of Glostrup, which is approximately 10 kilometers west of the city of Copenhagen.