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Rex Walls is the father of the Walls children in Jeannette Walls’s memoir, The Glass Castle. A charismatic and often charming man, Rex is also an alcoholic who is unable to keep a job and often resorts to stealing and other illegal activities to support his family. While he does provide for his children in some ways, he is also abusive, both physically and emotionally. As a result, the Walls children often have to fend for themselves, which makes for a difficult and often dangerous childhood.