https://si.wsj.net/public/resources/images/OL-AJ040A_RELAT_16U_20160524173942.jpg
48.8% of current NBA players have a direct relative who is a current or former 'elite athlete', defined in this case as anyone who has played a sport professionally, in the NCAA or at national-team level. That is in contrast to 17.5% of NFL players and 14.5% of MLB players.