The youngest of the Walls siblings. Maureen’s character is not as well developed as that of the other siblings. Seven years younger than Jeannette, she is a baby for much of Jeannette’s childhood and misses out on the adventures and disasters that the rest of the family has lived together. Later, in Welch, she spends time at her friends’ houses, where she finds the responsible adults and warm meals that are absent at the Walls household. However, Maureen turns out to be the only Walls sibling with serious mental and emotional difficulties. She spends time at a psychiatric hospital before moving to California.