After losing his salary in a poker game, Stanley left home and
JACK: (still looking at the paper) Did you read the paper tonight, Stanley?
STAN: No, Pop.
JACK: There’s going to be a war. A terrible war, Stanley.
STAN: I know, Pop.
[... … …]
STAN: Eugene’s a terrific kid.
JACK: Alright. Go wash up and get ready for dinner. And tonight, you and I are going to go out in the back yard and I’m going to teach you how to play poker.
For full extended scene, please refer to clips or the script edition cited here: Neil Simon, Brighton Beach Memoirs, Samuel French, 1984, pp. 101-103