My mother was my father's second wife. He had been through a very bitter divorce during WW2, with the result that he had gained custody of my half-siblings, even though he was on active service.
My father and mother married after the war and my brother and I arrived. Father's first wife remarried and moved abroad. Such was the bitterness that Father would brook no conversation about wife no.1, which of course made her super-fascinating and mysterious.
As a teenager in the late 1960s I was hitchhiking on the continent. Outside Clermont Ferrand I was picked up by a delightful Englishwoman who turned out to be that woman - she who should never be mentioned! She had the only picture of my father without a beard that I had ever seen, in her handbag after all that time, along with a Derringer pistol! One of the things she told me was that she thought that if anything ever happened to my mother, she and my father would get back together.
I told my father this tale; I think he was amused and interested, but was still unable to make a conversation. When she died my father said only 'thank god', and himself died shortly after.