That's preposterous, dear , the Stewarts aren't any more " legitimate " than my big toe is. Neither is Prince William the product of " inbreeding ", since his mother's line is quiye devergant from his father's. Also, since England has oly a titular monarchy, as long as Parliment is still the true ruling body, there will be NO " funny business " with the line of sucession.
I see that you actually take this royalty stuff fairly seriously -- almost a "hobby" or something. Ever thought of taking up something useful, say, bowling, instead?