Curry's son, Stephen Curry, is averaging 17.2 points and 5.9 assists per game for Golden State. He and Kings guard Tyreke Evans, who is averaging 20.3 points and 5.8 assists, are considered the front-runners to be top rookie.
"Oh, he's voting for Tyreke," Stephen Curry joked after his team's 103-94 loss to the Utah Jazz on Tuesday night. "That's good for me then. ... Just to be in that conversation is great for me."
NBA spokesman Tim Frank says Dell Curry will be allowed to vote for all the other postseason awards, but the league did not want to put him in an awkward position with the rookie award.
The New York Times first reported the NBA's decision regarding Curry's vote.
Curry played 16 seasons in the NBA with five teams.
Frank says the league will replace Curry with another voter who covers the Bobcats, but has not picked a replacement yet.