The story of the beginning of Moshe's leadership in the beginning of sefer Shemot seems to be interrupted by the list of the family lineage of Moshe and Aharon, which seems entirely out of place. However, a close examination of the verses in question will reveal a sharp difference regarding the role of Moshe Rabbeinu, as described at the beginning and the end of the chapter, and Moshe's lineage is critical specifically for the role described at the end. By noticing these differences we can gain a new understanding about Moshe's leadership and his unique role as the representative of God. 

Courtesy of the Virtual Beit Midrash, Yeshivat Har Etzion