The father appears to be the leader of the family (the head, who makes all of the decisions). The person who holds the next position in the family is the wife, and after her, the children, who seem to hold little to no power for themselves. Clearly, this is the traditionalist view of the household, where the man is domineering over the wife and the children, but this view changes as the novel develops. Ma is shown to have more power than previously assumed, as shown in her challenge of Pa's authority, and consequent victory of this quarrel (168-169), and the description of her as the "citadel of the family" (74), acknowledging the fact that her strength and hard-will kept the family together, strong and united. Without Ma, the family would most likely fall apart, thus making her vital and essential to its continued cohesiveness.
The concept of family and unity, initially, only applied to exclusively to each family, not inclusively to include all families as part of one, big group. It was used to be thought that "family" referred to only one of the sort, and not to the surrounding ones, but as the Joads move west, they realize that the idea of "family" in fact encompasses more than just one, sole family. The Joads, for example, were initially fending for themselves only as they began their journey out west. But when they met the Wilsons, a family in need of assistance, the Joads took them in and aided them in their time of need. "Family" now had a different meaning, not to just the Joads, but also to the families that were traveling west around them:
In the evening a strange thing happened: the twenty families became one family, the children were the children of all. The loss of home became one loss, and the golden time in the West was one dream. (193)The dreams and possessions that originally belonged to one family are now part of a big group of families that act as one unit. This is classified as "strange" because it was not used to be like this before – it was used to be every family for its own, with no relation to outside families that they had no connection with. However, the Joads are now realizing that families were merging into "one" big group – one cohesive pack in which families helped each other, moved with each other, and did everything with each other for everyone's advancement and in everyone's best interests. The dream to head out West was now "one dream" that was shared by all the families that were traveling together, with each and every one helping the other to reach this goal. The repetition of the word "one" stresses the fact that everything became communal in the society of families moving west – children, goals, losses, wins, advances, setbacks, etc. Anything and everything that happened to one family applied to the rest of the group, contrary to the earlier nature of each family being individual from the rest. Families were now working together to advance themselves and those around them, realizing that a joint effort was much more efficient and fruitful than a singular one.