Swimmer Tricia Duncan is the older sister of Tim Duncan, who professionally played what sport for 19 years
Tricia Duncan Patricia "Tricia" Duncan (born August 21, 1973) is a retired swimmer for the U.S. Virgin Islands who participated in the backstroke at the 1988 Summer Olympics. Duncan finished 34th in the 100 m backstroke and 30th in 200 m backstroke. She is the older sister of NBA basketball player Tim Duncan. Duncan attended Swarthmore College.
Dave Duncan (baseball) David Edwin Duncan (born September 26, 1945) is an American pitching consultant for the Arizona Diamondbacks of Major League Baseball (MLB). He is also a former professional baseball catcher and pitching coach. He began his MLB playing career in 1964 and played again consecutively from 1967 to 1976 for the Kansas City/Oakland Athletics, Cleveland Indians, and Baltimore Orioles.