I just caught a snippet of an old "Happy Days" episode... Mr. C is being cross-examined by Richie (All of a sudden he's a lawyer?) - at some community hearing about putting an offramp in and destroying "Inspiration point". Richie asks, "Do you have a family, Mr. Cunningham?" He responds, "I have a wonderful wife, a lovely daughter, and a smart-Alec son". So why wouldn't he mention Richie's older brother, Chuck, only seem in the early episodes? I had assumed that he was away at college, or in the Army? In either case, one would think Mr. C would mention him. That's why I think Chuckie died, or was disowned for some reason. Maybe he went to work for Ace Hardware, or some other big chain store. That would just about kill Howard.