proud father
(Noun): A father who cannot accept the fact his kid sucks at sports and will complain about playing time to coaches, managers, law enforcement, congress, the president, etc.. If the father still acts this way when his child is in college then he becomes a proud grandfather.
Why they hell did Jimbo write the letter to the school board about his son warming the bench the entire game, doesn't the proud father know the last time coach played Jimbo Jr., he score a basket for the other team.