Anastasia Romanova's sister(s)

An unnamed woman or an unknown number of unnamed women (died July 16, 1918 in the original multiverse) is/are the daughter(s) of Nicholas II and Alexandra Romanova, and the sister(s) of Anastasia Romanova and Alexei Romanov.

Biography
Prior to 1917, the woman/women was/were born to Nicholas II and Alexandra Romanova.