As with any story you tell later in life, some things will be omitted and others will be embellished. However, Larry knew what is what like to live with his father. He knew his father’s foibles and the reader can be pretty certain that the beginning of the story is relatively accurate. He knew that if his father got drunk, the family would suffer consequences. However, after he becomes drunk, Larry admits that the effect of the beer made him see things differently. It is possible that the story was told to him later and embellished with tidbits of gossip. He was pretty sick from the alcohol.