My grandmother had three children by two men. My mother has had three children by two men (and only just; she’s had 4 husbands). My adopted sister has had three children by three different men.
Meanwhile, both of my grandfathers and my father have only had children by one woman (that I’m aware of).
I guess women in my family are just less monogamous than average.
My anecdotal evidence is the opposite.
My grandmother had three children by two men. My mother has had three children by two men (and only just; she’s had 4 husbands). My adopted sister has had three children by three different men.
Meanwhile, both of my grandfathers and my father have only had children by one woman (that I’m aware of).
I guess women in my family are just less monogamous than average.