William "Tripp" van der Bilt III is a recurring character in the Gossip Girl television series, portrayed by Aaron Tveit. The elder cousin of Nate Archibald, Tripp serves as a rival for Nate later on as they compete for the affections of their grandfather, William.
Tripp van der Bilt is the grandson of William van der Bilt, who is "political minded," and Nate Archibald's older first cousin. Throughout the series, Tripp competes with Nate for the affections of their grandfather.
- William van der Bilt II (father)
- Unnamed woman (mother)
- William van der Bilt I (paternal grandfather)