This seventh aliyah contains the story of the tower of Babel. Here, people start building a tower to reach heaven in order to attempt to fight with G-d. G-d sees that they are one people speaking one language, and they are using their unity to attempt to oppose G-d. G-d therefore confuses them by giving them many different languages to prevent them from communicating with one another, hence the name "babel".
At the end of this aliyah, the Torah gives the descendants of Shaim. Included in these descendants are Terach, Avrohom avinu's father, and Avram, who will later become Avrohom. And here Avram marries Sarai and they are childless.