Here is a list of players that you could trade cousins for, some of them would need another player included, and some we would need to include another player. (I may have left out a younger player or two).
Andre Drummond, DET
Anthony Davis, NO
Blake Griffin, LAC
Damian Lillard, POR
Draymond Green, GS
James Harden, HOU
Jimmy Butler, CHI
John Wall, WSH
Karl-Anthony Towns, MIN
Kawhi Leonard, SA
Kevin Durant, OKC
Kyle Lowry, TOR
LeBron James, CLE
Paul George, IND
Andrew Wiggins
Russell Westbrook, OKC
Stephen Curry, GS