Hello: I forgot the 1949 version mentioned [Half Aunt/Uncle]. If your father marries [daughter 1], she become your step mother, her sister becomes your step aunt, and you can't marry her. If [daughter 1] dies, you can then marry [daughter 2]. However 5 sons from family [1] can marry 5 daughters from family [2], if those families were otherwise unrelated within the bounds of the table of affinity etc. It seems if the father marries [daughter 1] and she dies, he can then go and marry [daughter 2]. Bart [!!!] .... -----Original Message----- http://www.genetic-genealogy.co.uk/Toc115570145.html -------------------------------