 Fabritius de Tengnagel married Debora Kloppenburg (29 June 1739 - 2 November 1814), a daughter of Peter Kloppenburg and Johanne Marie van Laban-Ehelieden, on 27 April 1758 in Vreeland.They had two sons, Michael Peter Fabritius de Tengnagel (1. marts 1759 – 1810) and Carl Frederik Fabritius de Tengnagel (11. april 1762 – 7. februar 1824).The family lived at Holmens Kanal 2-4 in 1770 – 1772, then at Amaliegade 2 in 1773 – 1775 and finally at Slotsholmsgade 12 in 1776 – 1805.