If he lived in sub Saharan Africa, he would be chopped and his body parts sold.
Your former PM is 1/8 Turkish and his surname should've been Kemal. Boris Kemal. Rishi Sunak would not have been the first "ethnic sounding" PM.
Though on another side of his family, he's related to George II or III (of England), so he's distantly related to King Charles and QE II. So I guess he wouldn't be burned or chopped.
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@Joe - what if the child didn't ask for a part of your estate but just asked to have a relationship with you? (example a few beers or lunch every now & then)
And btw, are illegitimate children entitled to the same portion of inheritance as legitimate ones? (if there was no will) I don't know the laws re: this in the UK, US, Aus or TH.