Will I ever be able to draw close to my son again?
The father was very aggressive towards his family especially in the beginning. He would be overly angry at his son for unnecessary reasons.
Hey dad! Can we play with my new ball?
Not today, son. I'm too busy...
He realized that by holding his sons hand up like a winner of a boxing match and nearly knocking down furniture in front of a crowd didn't make his son feel comfortable or proud, instead embarrassed.
Now I can spend time with my son now that I'm retired!
After the change, the father is more gentile and aware of what is coming out of his mouth. He realizes that the actions he made towards his son has consequences and now their relationship is broken.
Oh, that's okay. I understand you have a family to take care of...
The father was too busy to spend time with his son. Although they didn't spend much time together, he is still an inspiration to his son.
His retirement made him change because now that he doesn't have a busy job anymore which, occupied all his time, he has free time he can finally spend with his son.
The father after the change is in the state of realization. After he retires, he tries to reconnect with his son but is unable to now that his son is in his own shoes. This makes the father full of regret now that he realizes he wasn't the best role-model to his son.