Prince Edward, Duke of Kent, married Princess Victoria of Saxe-Coburg-Saalfield.
Their daughter Alexandrina Victoria was born on May 24, 1819.
Prince Edward died in 1820. Suppose he lives until 1822.
Suppose he and the Duchess of Kent have a second daughter. Her name is Henrietta. She is born in 1821.
Victoria becomes Queen of England in 1837.
Who does her sister, Princess Henrietta marry?