What Caused Rex Actions in "The Glass Castle": Alcoholism or Personality Extension

The Glass Castle
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Are Rex Actions caused by alcoholism or is it an extension of his personality
Rex Walls in the book is portrayed as someone searching for an elusive dream. After spending years traveling in search of gold to build the glass castle solar energy powered for his family, he transition from illusion to reality of never becoming rich, alcohol takes over his life. Rex actions are caused by alcoholism more than just his personality because he often resorted to drinking when faced with problems.
Rex felt frustrated and could not take care of his family, at one point his son Brian was forced to sleep with an inflatable plastic raft over his body to prevent him from rain while other children cou...