She is the wife of Mack Gerhardt, and she and her husband have two daughters, Lissy and Jenn. Mack and Tiffy have a very strained relationship, which involves adultery committed by both husband and wife, most notabley Tiffy with Colonel Ryan. Tiffy's best friend Kim Brown says that abuse when Tiffy was growing up caused her to marry a man of violence, though one that channeled it into his work. Lissy is the first to find photo evidence of Tiffy's affair with the Colonel, then Kim sees it, then finally Mack finds it, which cause Bob to physically restrain him from killing the Colonel right away. There is also some suicide threats, and other physical violence, from Mack when Tiffy tries to cover up all her wrongdoings. Eventually the two make up and Tiffy ends the relationship with the Colonel.