I don’t think it “reveals” is the right word, the word should be “retells”, because everyone knew he was a piece of dung from the beginning.
Remember he woke up his nephew Michael Smith on Good Friday to get drunk, and Smith was arrested for rape soon after.
Teddy was a dark force of destruction. Nothing good came from him.
This movie should have been done in the 80’s, but no one dared.
The old man pushed Joe, Joe pushed Jack, Jack pushed Bobby, Bobby pushed Ted, and Ted fell on his ass. The hapless loser of the family, thrown out of Harvard for cheating, and would have been a bartender in Boston except for his family.
Pretty good summary....