I hope you are hanging in through all this. Perhaps I can summarize and show why it is all relevant.
Remember that Chronicles was written after the exile and long after the Northern Kingdom of Israel had been destroyed. Yet, God’s people, from the north and the south, had not ceased to exist. Some from the tribe of Simeon lived in the hill country of Seir. The descendants of Manasseh lived near the river of Gozan. That these genealogical records existed was proof that God’s people had not been lost.
But there is something else: There are three genealogies that occupy the most attention. The first is Judah, the royal line of the Davidic kings. The second is Benjamin, mentioned in the middle of 1 Chronicles 1-9 and then again at the end. Judah and Benjamin comprised the two families of the Southern Kingdom, the “remnant” of the people of God not scattered. The third group are the Levites, occupying 81 verses, the second longest listing. The Southern Kingdom, and the priesthood, were to be the hope of the people of God. God had preserved them, but not just them. As you come to chapter nine, the Northern Kingdom is also represented with the mention of Ephraim and Manesseh. God’s people have come home. God has preserved the descendants of Jacob and they have gathered in the place God has caused His name to dwell – Jerusalem.
God knows His children, knows them by name, and knows where we are. Though we may find ourselves punished because of sin and exiled, he is determined to gather all those who wear His name and are willing to repent and return to Him.