Reply #62: I'm not up on the modern interpretation,

[wickerwoman]

but I think after Richard the Lionheart died, the law was changed so that the Crown skips over children of deceased siblings who never inherited. I think Richard III used a similar argument to disinherit his nephew.

You have three brothers: Richard, Geoffrey and John in that order. Geoffrey has a son, Arthur, and then dies. Richard is king and then dies. The throne skips the son of the deceased second brother and goes to the third, John.

So, unless they've changed the order (and they probably have, but who knows with royals) if Charles dies before Elizabeth, then her second son (Andrew?) has historical precedence for disinheriting William.

The throne goes to the oldest surviving son of the last sitting monarch, not the oldest male direct descendant.