Divergence does not automatically erase kinship. The Children of Luna have branched across the Moon, near-sun colonies, remote settlements, and transit routes, yet they continue to recognize each other as belonging to one larger population. That persistence is not sentimental. It is maintained through continuity practices.
Shared memory standards, legible lineages, translation discipline, and reciprocal recognition of continuity claims all help hold the population together. Branches may differ in architecture, tempo, and environmental adaptation, but they still know how to read one another historically.
This is why divergence has not turned into fragmentation in the simple sense. The branches are different enough to surprise each other and similar enough to remain accountable to a common civil inheritance.
Kinship survives because continuity was designed to travel farther than any one habitat.