Of course it's been a big deal, but I got into genealogy. Found my 7th great grandfather in direct paternal line. Found another descendant in direct paternal line from my 7th great (from a different son). Did Y-DNA testing.

Turns out, yeah, every one of those men's father was who they thought he was. Our Y DNA was the same, minus the mutations you'd expect over 400 years on separate branches.

That humans make a big deal about parentage and infidelity, doesn't mean humans aren't faithful. Apparently we're the most faithful of pair-bonding species by a big margin.