What relation was Olga to Grand Duke Constantine Nikolaievich?
Niece
Daughter
Sister
Cousin
Answer
Olga was the daughter of Grand Duke Constantine Nikolaievich. Grand Duke Constantine Nikolaievich was the second son of Tsar Nicholas I of Russia and his wife, Alexandra Feodorovna.
Imperial Intrigue: Unraveling the Story of Olga Constantinovna of Russia