Eugene reacts differently from the rest of the family because he never waits for them when they go hiking. His father is upset because he thinks that the family has to "enjoy together."
Reason for Father's Annoyance
In the text, Eugene's father was annoyed because he runs away from the family when they go hiking in the mountains.
Father said that he had a hard life when growing up and had every reason to run away but Eugene had his family and should not run away from them.
Father believes that they should enjoy themselves together so Eugene should not stay apart from others.
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