[2] He had one older sister and two younger brothers, one of whom was Anton Martin Schweigaard, a professor and ten-term member of the Norwegian Parliament.
[3] Schweigaard married fellow Kragerø citizen Marie Margrethe Rømer (1814–1889).
Their only daughter Marie Magdalene married jurist and politician Lars Anton Nicolai Larsen-Naur.
Their son Johan Elias married a daughter of Niels Anker Stang,[1] became a senior physician, and was the grandfather of judge and politician Elisabeth Schweigaard Selmer.
[2] Through his brother Anton Martin, Tellef was also the uncle of later Prime Minister Christian Homann Schweigaard.