My Mum, the only one in her mostly red-headed family to be born with jet black hair, was told she must have inherited her hair colour from her Spanish ggg-grandmother. (This is one of the reasons I started researching my family history.) Well, the Spanish grandmother turned out to be an Italian great-grandfather - a rogue who fathered her grandmother out of wedlock! I would never have found him if she hadn’t helpfully named him on her marriage certificate.
He was one of my more interesting ancestors. After arriving in England as a mariner, he became a boarding house keeper, then a pawnbroker, and finally a ship owner, who had amassed a fortune by the time of his death at age 91, outliving three wives - and at least one mistress.
It goes to show that these family stories are worth checking out!
Arkay