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.
Dominique Duncan Dominique Lynn Duncan (born May 7, 1990) is an American–born Nigerian sprinter who is eligible to compete for Nigeria after switching allegiance from the United States of America. Dominique is a national and African record holder after she won gold alongside Blessing Okagbare, Regina George and Christy Udoh in the Women's 4 × 200 metres relay event at the 2015 IAAF World Relays in Nassau, Bahamas.