quarantine 'em

Exactly which person died before the other is subjective, depending on your velocity as you observe the two deaths, which in turn can affect the chain of succession

As I understand it, legally speaking, two events are never considered to be simultaneous, which is really interesting to me while also resolving a vast slew of potential legal edge cases

For example if two people die in a car crash and have conflicting wills, you place one death before the other and execute the wills in that order

This obviously develops from Terry Pratchett's bit about kingons and queons and may hopefully lead to a Grand Unified Theory of monarchic force exchange

So, for example, suppose Queen Elizabeth II and Prince Charles were to die "simultaneously" - or rather, their deaths are spacelike-separated events

If I'm getting my succession rules correct, then an observer who sees Elizabeth die first would consider her son Charles to be the monarch from that point onwards. When Charles is observed to die, the throne passes to his son William (cont.)

"Meanwhile", an observer who saw Charles die first would consider Elizabeth to continue as Queen. On observing Elizabeth's death, they would consider the throne to have passed to her second child, Prince Andrew (I think?)

Also, Anne is her second child. When the Queen was crowned Anne became the second in succession, but by now is 14th in line