Researching Famous Relatives other than myself
Answers
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I suspect Henry VIII will be too distant to appear in Famous Relatives. If you look at the complete list for you, they are all in the past 150 years or so. The funny thing is, none of Henry VIII's children had children. Edward VI, Mary I, Elizabeth I, and the illegitimate Henry FitzRoy (which Henry publicly recognized as his child) all died without children. There are other speculative children of his that were illegitimate and never recognized by Henry. You can get that list from a simple search.
My guess is your brother in law may be descended from Henry's sisters, either Margaret or Mary. They both had a number of children, but I am not familiar with their lines.
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The third-party site Relative Finder may be able to find the relationship. You'll need the IDs of Henry VIII (or actually of his parents or sisters) and of your BIL's nearest deceased ancestor(s).
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