Question: What Russian female had siblings Alexander Vorontsov, Elizaveta Vorontsova, and Semyon Vorontsov?
Sentence (from "Semyon Vorontsov"): Count Semyon Romanovich Vorontsov (Russian: Семён Романович Воронцо́в ; 26 June 1744 – 9 July 1832) was a Russian diplomat from the aristocratic Russian Vorontsov family, whose siblings included Alexander Vorontsov, Elizaveta Vorontsova and Yekaterina Vorontsova-Dashkova.
Relevant evidence: Yes