I wasn’t looking at the GEDCOM date, it’s the Facts and Events tab, view where the *undated* marriage is before the birth (1860).
The dates aren’t from Ancestry, they’re from the family member of that branch that did extensive genealogy and then wrote a book. Not always accurate, but a starting point. It wasn’t uncommon to marry and have kids before 16, so it’s hard to say. To find birth/marriage/death records won’t be attempted until sometime next year. (When I can access the Archives via transit.)
I didn’t catch the mother’s birth being too close to her first child (1870).
However, still don’t understand how the birth, if it had been 1860, came before the marriage, undated.
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