Terrence "Terry" L. Greenbriar, Jr. is the father of Samantha and Kaitlin Greenbriar, and is married to Janice Greenbriar. He is the author of The Accidental Savior, a book originally planned to be a trilogy.
Terrence was born in 1951, and spent many of his early years at the house on Arbor Hill with his uncle, Oscar Masan. His father, Terrence Greenbriar, Snr., was also an author, and someone whom Terrence strived to please. At some point after his twelfth birthday, Terrence ceased to visit his uncle's home, and indeed did not visit for many years until the passing of Oscar Masan in 1993. When the property was subsequently bequeathed to Terrence, the family eventually moved in in 1994.
- Terrence's book, The Accidental Savior, can also be found in the game Firewatch (2016), suggesting both games share a universe.