Double trouble
The Duchess of Cambridge’s acute morning sickness was said to be associated with twins, raising the prospect of an awkward question of succession, especially if twins were to be born as a result of caesarean section. No monarchy has yet been tested in such a way.
—Prince Vincent of Denmark was born before his twin sister Princess Josephine in 2011, but neither is likely to succeed to the throne as they have two older siblings, Prince Christian and Princess Isabella.

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