Tersa - thanks for the info. I don't have much more, except that my elder sister(Catherine) told me about it just after my Father (Herbert Charles) died in November 1951 at the age of 41. It appears that "the curse" was mentioned to my mother by a member of his family on the occasion of their marrige (nice present) and was pretty much along the lines which you indicate. I was also told by my mother that my brother (mike) and I would be the last of the male line in that branch of the family. Well, here I am at age 58 + with two grown up sons Chris and Andy.
As I said previously, I do have bits of information and a copy of a family tree on which some of my ancestry appears. I'm more than happy to share it, although some of it you may have from other sources already.