Are you or your cousin a direct male descendant of your Alan Frost? Have you submitted your y-DNA anywhere?
I went back through the thread and saw that your Alan is your wife's father, not on your side.
Don't post it, but 1) when and where was your wife born? Have you looked for anyone named Alan Frost in the area at the time? Does that help you estimate Alan's birth year? Or in Toronto in 1958? If you are in the UK, could he have been a Canadian soldier stationed there?
I'm sure you've probably asked yourself all these questions in the past 30 years, but I listed them just in case.
