In a wonderful celebration of Father's Day, the hilarious crayons love their dads -- and father figures in their lives -- so much, they wrote a book about it! Red Crayon loves his dad because he draws the most perfect hearts. Green crayon loves his grandad, who has a real green thumb. And Purple crayon appreciates his mom on Father's Day, even if she colours outside the lines. In this inclusive celebration of all kinds of families, the crayons love celebrating their dads -- and other family members -- on Father's Day.