The reason for my asking is that Czar Paul of Russia had two daughters who became queens consort of foreign countries. But Catherine and Anne sat on their respective thrones at different times.
That was why I excluded the case of King Constantine II of the Hellenes and his older sister, Queen Sofia of Spain: he was formally deposed in 1973, when the Greek monarchy got abolished, and this was two years before his brother-in-law got called to the Spanish throne as King Juan Carlos.
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