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I've just watched the (pseudo)documentary The Real King & Queen on Discovery.
It investigates the claims of various families round the world who say they're descended from George III and Hannah Lightfoot when he was Prince of Wales. They all took a DNA test which in the end highlighted they were not related to George III's descendants.
But what if one of these families - the Rex family of South Africa, or Mackelkans of USA - was shown by this test to be actual descendants?
What would happen? Would the UK need to replace its Royal Family? Or would Parliament just produce a bill removing Hannah Lightfoot's descendants from the succession?