Herb's Father is a character that was only mentioned by Herb.
Appearance and Personality
It is not known what he looks like due to his absence, all that is known so far is that he has the same nose as Rodney.
Long time before the events of the film his son Herb wanted to be a musician but he was afraid that Herb would not realize his dream and that is why Herb became a dishwasher.
Herb's Father never physically appeared in the film which means he probably died before the event.