The has been a fairly long tradition in The US 0f A, of subjecting family member of the President to a high degree of public scrutiny.
While this started with the Kenedy's, it didn't get into top gear till Jimmy Cartes time.
Jimmy was 'blessed' with a rather eccentric brother and The Press had fun.
Ronald Reagans son Ron, a proffessional dancer, was targeted, but happily seemed capable of ignoring the fools.
George H. W. Bush's son George W, later president had his University and military records scrutinised at great length and when reporters, not themselves famous for their sobriety, finished with this, they concentrated on his youger drinking habits
Never mind the Windsors, just look at the dysfunctional Markle Family and consider what sort of private life would be available for her, if she was elected to high office.