Anecdotal: in last three generations of my family we had three confirmed incidents of this. It's only what we know. Including my own first marriage (I divorced

Anecdotal: in last three generations of my family we had three confirmed incidents of this. It's only what we know. Including my own first marriage (I divorced, though it wasn't a secret, since the marriage de facto already did not exist by that time) Not 30% but not 1-2 also..