Rev 21;24-26 " The nations will walk by the city's light and the kings of the earth will bring their splendour into the city.
On no day will the city's gates ever be closed since there will be no night there.
And they will bring the splendour and the wealth of the nations into the city."
*Interesting the reference to nations. These operating/living out of the city. Bringing their "splendour and wealth" to the city.
There is also the reference to "kings" of these nations.
Paul points out there will no longer be Jew of Greek, Scythian, barbarian..
So these nations must be different.
Since the children of Christ, the barren woman of Galations reference, are more than the flesh; and every family in heaven and on earth are named by the Father; these nations must be all related.
But in that matter of being related are they cousins, or siblings.
Perhaps the kings are the ecclesia, and the nations are also children, but not at the same level.
Could also be like the Levites were among the 12 around the temple, yet not their own basis of position in the camp posts of 3 tribes on each side, but amongst the people. All related, yet different positions.