Is marriage between step-mother step-son legal?

== == I would not think it would be illegal as long as the father was dead. Even if he and the wife were divorced,it would be in very poor taste for a son to marry his father's wife. The book of First Corinthians in the New Testament mentions a church member who was having an affair with his father's wife. Apparently this was a step-mother;perhaps and older woman or maybe the father had married a much younger woman. Reuben;a son of Abraham in the book of Genesis had an affair with his father's concubine;this too was an older woman. I do not see any reason they could not marry providing the father was dead. However;some might still see this as poor taste to do such a thing. These days there are a lot of HOT older women. I'm 59 and I would choose a woman over 50 over any young thing if i were to marry again if GOD forbid my wife died.