Based on Jeannette's description of her grandparents and uncle in Welsh, Rex's childhood must have been marked by poverty and strictness.
The Glass Castle
In the Glass Castle, we learn of an engineer named Rex who took his family to his hometown Welch. The city is marked by poverty as Jeannette observes.
She also found no similarity in the faces of her parents and grandparents. When the children laughed they were met with a broom by their grandma Erma who wanted no one laughing in her house.
All of these must have made Jeannette believe that her father Rex, had a hard time groowing up.
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