How are three ways in which the Rose Mary and Rex Walls bad parents?

There many ways these guys make the worst parents of the century. Much of how they bring their children up amounts to neglect and even abuse. The children are frequently left alone in dangerous situations. Jeannette's dress catches on fire when she is left alone to grill hotdogs: Jeannette is only three years old. Rose hides food and chocolate from her own children. Really the list goes on but the basic idea boils down to selfishness and a complete lack of responsibility towards their children.