The term 'DAD'S RIVAL' can be solved by the crossword solutions BARQS (5 letters), HIRES (5 letters), and AANDW (5 letters). BARQS stands for the soft drink brand Barq's, which is owned by the Coca-Cola Company. HIRES is a brand of root beer that was created in 1876 by Charles E. Hires. AANDW stands for A&W Root Beer, which was first sold in 1919 by Roy W. Allen. All three of these brands are popular root beer brands that compete with each other in the marketplace.