Q: In this task, you are given Wikipedia articles on a range of topics, we ask you to write a question based on the content of the articles that can be answered in a binary manner i.e. True or False.
John Redcorn -- A former roadie for Winger and ''Licensed New Age Healer'', John is Nancy Gribble's Native American masseur, her lover of 14 years (the two split up during the show's fourth season) and the biological father of Joseph Gribble. Both Dale Gribble and Joseph are completely unaware of this, although it is obvious to everyone else in the neighborhood due to the close resemblance between Joseph and John. John has a sister, who Nancy seems to assume told everyone about their affair. A recurring gag is that whenever Dale makes a comment about being Joseph's father, John shows up. It is mentioned in season 5, episode 4 that John is a member of the Anasazi tribe.
A:
does john redcorn know joseph is his son