House Tethras initially started as House Garen, whose founding predated the Blights and produced dozens of kings. Paragon Orrick Garen was a King of Orzammar (the only one to have been made Paragon during his reign) who lived in the early Exalted Age. His son, Tethras, was exiled into the Deep Roads for murdering his sister Unaria. When it was eventually found that the Carta had been responsible, Garen started sending numerous units of the Legion of the Dead in search of his son. Despite a decade of searching, Paragon Garen was unsuccessful and as a tribute to his son, the heirs of House Garen took the name Tethras after him. Eventually one of these members became a Paragon on his own right and founded the noble House Tethras.
Tethras Garen: Son of Paragon Orrick Garen who was unfairly exiled to the Deep Roads. House Tethras is named in his honor.
Paragon Tethras: Founder of the House.
Dusan Tethras: A smith who tried to become a Paragon but ended up poisoning himself.
Andvar Tethras: Father of Bartrand and Varric and former head of the House. He died five years later after the house's exile in 9:3 Dragon.
Ilsa: Mother of Bartrand and Varric and wife of Andvar. She took to drinking after her husband's death which left the young Bartrand to assume the leadership of the family. Died of a liver ailment in 9:26 Dragon.
Bartrand Tethras: Born in 8:93 Blessed, he assumed the leadership of the family a few years after they were exiled to the surface and the family's fortune and power was substantially increased.