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Imagine you are standing in a cemetery in Malmö looking at a grave from 1985. You need to know if the deceased person's spouse (registered in 1980) is still alive or where they moved. With the portable database on your phone, you instantly query the 1980 household structure.
True portability requires that the dataset works on:
1980 hits a sweet spot for modern genealogy:
Unlike modern population registers that obscure relationships, the 1980 dataset often includes a familj-id . By sorting by that ID, you can reconstruct an entire household—parents, children still at home, and even cohabiting grandparents.
