Genesis 30 is about Jacob's family growing and becoming prosperous. Both Leah and Rachel have children with Jacob and also their maidservants have children with Jacob, eventually twelve sons in all ( ie. twelve tribes of Israel). We see in this chapter God faithfully continuing to bless the descendants of Abraham through Jacob, despite the dysfunctional mess of a family that resulted from his multiple wives. Once more we realize that it is only by God's sovereign will and purposes that history moves as it does, not because of man's control or wishes.