In part IV, how does Jeannette's parent's living situation create conflict for the children?

Three years after Jeannette left Welch, Rex and Rose Mary Walls arrive in New York in a white van, declaring they have moved permanently to New York to be a family again. The couple is kicked out of two apartments before they begin living in Lori's home. However, Lori is fed up by her father's drunken fits and her mother's aloofness and she is forced to kick them out of the apartment. Rex and Rose Mary live in the van for a time until it is towed. They become homeless. Jeanette protests her parents' new lifestyle but Rose Mary insists that "being homeless is an adventure" and refuses to do anything to change the situation.