In the fourth aliyah is the story of how Leah's son brings home mandrakes (a type of flower) for his mother. Rachel asks Leah for some of them because they were considered to increase fertility and she didn't have any children yet.
Later in this aliyah, Rachel has a son, whom she names Yosef. At that point Yakov asks Lavan for permission to take his wives and children and leave. Rashi says that once Yosef was born, Yakov felt ready to face Esav. Lavan begins to answer Yakov's request to leave by recognizing that he (Lavan) prospered by having Yakov around. This is a lesson to us, we prosper by having righteous people and institutions in our communities.