This chapter details the chief descendants of Reuben, Gad, and Manasseh. These are the names of 2 sons of Israel and 1 grandson. Verse 1 explains that Joseph received the birthright and why. Manasseh was one of Joseph's two sons.
Also in this chapter we can see the answer to one of our questions. Specifically, does this chapter teach anything about Jesus? Yes it does! Verse 2 says that Judah prevailed above his brethren even though he was not the first-born son of Israel and that "the chief ruler" came from him. This is the line of David, king of Israel and Judah. Jesus is the descendant of David and He will rule upon David's throne.
The chapter tells us that the genealogies of the 2 1/2 tribes that are given in this chapter were compiled during the reign of Jotham, king of Judah and in the days of Jeroboam, king of Israel. These tribes had worked together to enlarge their borders. They were all fierce warriors who were skillful with buckler, sword, and bow. They were able to conquer the Canaanites because they trusted in God and cried unto Him during their battles.
These tribes all inherited land near each other. They lived in the Gilead region.
Scripture doesn't state how far removed the following are from Reuben:
Beerah (He was carried away by Tilgathpilneser of Assyria)
Jeiel (A chief of the family)
Zechariah (A chief of the family)
Bela (A chief of the tribe)
Their cattle were much increased in Gilead so they also lived in the wilderness extending from the Euphrates River. They also defeated the Hagarites during the days of Saul and possessed their land.
The families of Gad lived in Gilead in Bashan and nearby towns near the families of Reuben. The leaders or chiefs of Gad were:
Their brethren were the sons of Abihail:
Half of the tribe of Manasseh lived from Bashan to Baalhermon and Senir and unto Mount Hermon.
Here are the names of the heads of this half tribe who were all mighty men of valor before the tribe turned to idolatry and was then carried away by Assyria: