How does Erma Differ from Grandma Smith?

The Glass Castle
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How does Erma differ from grandma Smith?
Erma Rex mother is different from Grandma Smith because Erma is more abusive and cruel, bitter towards her grandchildren and her children she is portrayed as a racist. However, grandma Smith has strict rules and punishment for those who break her rules. Grandma Smith is responsible for her family and takes care of her grandchildren better than Erma.
Why does the author the author says she better understands why her father is the way he is after meeting her.
Rex tried to stop drinking just for a while, but he would eventually slip back into her old drinking habits that is why Jeanette stopped believing in her father so much she u...