Nicholas with his two eldest children, Grand Duchess Olga (left) and Grand Duchess Tatiana. This is most likely a family snapshot as both girls are casually dressed and sitting informally.
Tsar Nicholas II's Voice (Recording) I hope this pins. Apparently Empress Marie had voice recordings made of the entire family. The girls had what was described as sweet feminine voices, the Tsarina's was low for a female. When she escaped these were all left behind with Bolsheviks who were, oddly, meticulous about keeping records of the Imperial family.