"Being royal": I wonder what that means.
A person can marry in and become uber-royal (Prince Philip).
A royal-born can marry out and remain royal (Charlotte Casiraghi, Eugenie/Zara/Peter etc).
Is Mike Tindall royal? If so, why? If not, how royal is Meghan Markle (asking about her specifically given how she's pushing Meghan Sussex now)? Is Harry royal after his disloyalty to and disdain for the wearers of the crown and the nation's subjects (reverse-treason?!)?
Personally I don't think Mike Tindall or Meghan Markle are royal: they're married to members of the royal family, can become divorced and would then be neither members of the family nor royal. Had she lived, I think Diana wouldn't be deemed royal today, notwithstanding being the future kings' mother and grandmother.
Just pondering. I think royalty is a matter of royal acts and service to subjects, rather than a matter of fact. I don't think the Duke or Windsor was royal after abdication (certainly not his wife).