"Reunion"

Charlie wanted to see his father, whom he had not seen in three years. Charlie's father met him in the train station and Charlie thought he resembled him, and asked himself if he shared his same limitations. They went to a lot of restaurants, but they never ate anything because his father just ordered drinks in a nasty way and the waiters told them to leave. Time passed and Charlie had to go back to the station to catch his train. His father offered to buy him a newspaper to read on the train. He went up to a newsstand and spoke to the clerk in the same nasty way; the clerk didn't pay attention to him and turned away. Charlie said goodbye and went down the stairs to the train while his father insulted the seller in the newspaper stand, and that was the last time Charlie saw his father.

Questions:

1. Why was Charlie's father so nasty when he talked to other people?  

2. Was Charlie's father an alcoholic?

3. Was Charlie underage?