Dan exploded with anger; saying that he doesn’t owe him anything and doesn’t owe their dad anything.
Ed also asks why he never tried to get to know them and Dan yells that, surprisingly, he did.
I’m sure you know what happened next.
But, the argument still escalates to the point that they almost get into a fist fight, with both men putting up their dukes like old-timey boxers with handlebar mustaches.