Moses' Family Tree - Exodus 6:13-27

The back-and-forth saga between Moses, Pharaoh, YeHoVaH, and the Children of Israel is interrupted by Moses reflecting on his family tree. Moses focuses on Israel's first, second, and third sons born of Leah, the older sister of Rachel, Israel’s favorite wife. What are Moses' reasons for only focusing on three of Israel and Leah's sons and not the rest of the sons of Israel?

In preparation for this study, Moses’ Family Tree, please read Exodus 6:13-27.