"Ma Joad: Ma is, in Casy's words, "a woman so full of love" she can be frightening. Against all gender expectations of her day, Ma provides the moral and emotional center for the Joad clan. She is committed to caring for all people as she can (witness her inclusion of Casy when the family sets out for California) and, even though this conviction faces sore testing along the journey, Ma ultimately holds fast to the truth that true family is larger than biological relations. While Ma urges her parole-breaking son Tom not to get angry, she finds her own righteous (not self-righteous!) anger growing as her family faces more and more deprivation and humiliation. She learns-and, through her, readers learn-about the right use of anger in changing society, even if in small but significant ways (such as persuading Rose of Sharon to offer the breast milk produced for her stillborn child to a "stranger" dying of hunger at the novel's end)."
"Pa Joad is a strong man who "figures" as hard as he can how to handle the family's problems (a recurrent motif in the novel), but his "figuring" ultimately yields to Ma's decisive actions. This sea change in gender roles of the time is seen perhaps most clearly in the final chapter, when Ma makes the decision that the family must seek a dry place to stay. Throughout the book, Pa comments that Ma's increased assertiveness represents a fundamental change in the world he knows."