"Rickson is the name for a fictional son that I created in order to combat the Lion of The Gracie Family on Carlos' side - Carley Gracie, who claimed to be undefeated in life, and also claimed to be the most technical of the whole family. It is said that he could stop a fight between Gracie brothers or cousins merely by offering to join in the fray. (source: http://www.gracie.com/carley/index.shtml) So, I created my own Lion...Rickson! He doesn't really exist. I just decided to take him out of the limelight years ago because, let's face it, with a record of several thousand wins (counting school yard fights and fights with his brothers), what does he have left to prove? I decided it was best to retire my "son". Fortunately, Carley is no longer a factor, after that unfortunate incident where he attacked some police officers...awful, simply awful. That's all I have to say."
-Helio Gracie (rough translation, source of interview unknown)