Yet I have looked into it, and I do dispute it.
And you clearly said 'Every monarch', which is not so, and is evidence of your cavalier approach to facts.
And American Presidents have obscure Royal links (Bush being unusually close, being a distant cousin of the Queen) because they tend to be of European ancestry- not even slightly unusual in the States- and it is almost impossible to be of European ancestry and not have a royal link somewhere inside your family tree. Hell, I am more royal than most of those Presidents, by that logic. It's meaningless- they are no different to anyone else.
And if your only defence is to say any source we can find must be untrue if it conflicts with your views because it was 'planted' than that is truly feeble. It makes it impossible for you to engage in any form of rational debate because you will blindly deny the authority of any conflicting source.