Which families married which.

Two surnames sit at the center of nearly everything: Calandriello and d'Amato. Between them they appear in a huge share of the tree's marriages — Calandriello alone shows up in 394 marriages across 95 different partner surnames, d'Amato in 372 across 106. And when you ask which two surnames married each other more than any other pair in the whole tree, the answer is those same two: Calandriello and d'Amato married 21 times, tied with Calandriello and Petrizzo for the single most common alliance documented anywhere in the tree.

That's not a coincidence of a couple of prolific individuals — it shows up at every level. Calandriello is also the most common marriage partner for six other major surnames (di Brizzi, Rubino, Arnone, Pinto, Russo, di Bella, Libretti, Ferro), meaning if a family in Sassano married outside its own name, Calandriello was disproportionately likely to be on the other side of that marriage. d'Amato plays the same role for Feminella, Pellegrino, Abbatemarco, Trotta, and Florendino. Between them, these two families functioned as something like the connective tissue of the whole town's marriage network — the families everyone else was likely to marry into sooner or later.

Same-surname marriages — two people who already shared a family name marrying each other, which in a town this size usually means some degree of relation even before you trace the exact connection — happened 60 times across the tree. Calandriello leads that list too, with 7, followed by d'Amato and Petrizzo at 6 each. For the exact blood relationships behind marriages like these, see the cousin marriage analysis — the two pages are looking at the same underlying pattern from different angles.

Worth noting: almost none of the top surname pairings show a Chicago connection directly — these are overwhelmingly historical, Sassano-based alliances from before the migration, which makes sense given how much deeper the tree's Italian branches run compared to its American ones.