The Seven Pounds star is married to actress Jada Pinkett-Smith and the couple have two children, Jayden and Willow. He also has a son, Trey, from a previous marriage.
"Put any Smith in there, it's Number One," he joked to Access Hollywood. "[Jaden's] just well adjusted. Willow is the one. That's the one I have to keep my eye on - don't let her get to Number One!"
Jayden appeared alongside Smith in The Pursuit of Happyness and is currently starring in The Day The Earth Stood Still alongside Keanu Reeves, while Willow made her big screen debut in I Am Legend.