Richard Pryor's family are not happy with Nick Cannon potentially play the role of their dad but picks Marlon Wayans for biopic.  It looks as if Nick may need to fight Marlon for the approval of the family and production studio.  

According to TMZ, Richard Pryor Jr. and Rain Pryor want Marlon to play their dad. They do not believe Nick has enough acting credibility to take on such a coveted role.

"They believe Wayans understands their dad's psyche and can connect with the character in a compelling way."

The children of the legendary comedian has problems on their hands.  They believe the biopic makes their father look bad at the expensive of their step-mother, Jennifer Pryor.  Plus, the children were left out of project.