Question: Who is Pyotr Karatygin's sibling-in-law?

Knowledge 1: Pyotr Karatygin
Pyotr Andreyevich Karatygin (11 July 1805, Saint Petersburg, Russian Empire, - 6 October 1879, Saint Petersburg, Russian Empire) was a Russian dramatist and actor.The tragic Vasily Karatygin (1802-1853) was his brother.Karatygin debuted on stage in 1823 and rose to fame performing in Alexander Griboyedov's "Woe from Wit" (the parts of Zagoretsky, Repetilov and, since 1831, Chatsky).In 1832-1838, as a head of the Drama department in the Saint Petersburg's Theatre College, he discovered and tutored several of the future Russian stage stars, including .Pyotr Karatygin wrote 68 plays, 53 of them vaudevilles, mostly elaborate variations on foreign plays and Russian novels.In the 1860s and 1870s he wrote a series of short memoirs on the history of the Russian theatre.Edited and previewed by his son, Pyotr Karatygin's "Notes" were serialized by "Russkaya Starina" in 1872-1879, to much critical acclaim. [SEP] Knowledge 2: Vasily Karatygin
Vasily Andreevich Karatygin   was a leading actor of Russian Romanticism.Karatygin joined the Bolshoi Theatre in St Petersburg in 1820 and moved to the Alexandrine Theatre in 1832.He particularly excelled in the numerous productions of Shakespeare's and Schiller's plays, rivalling Moscow's Pavel Mochalov as the greatest Russian actor of his time.The two volumes of his "Memoirs" are invaluable.Like other actors of his theatre, Karatygin was buried at the Smolensky Cemetery on Vasilievsky Island.His remains were later transferred to the national pantheon, the Alexander Nevsky Lavra.His wife Alexandra Kolosova was admired for her roles in Molière's comedies.
Knowledge 1: Pyotr Karatygin
Pyotr Andreyevich Karatygin (11 July 1805, Saint Petersburg, Russian Empire, - 6 October 1879, Saint Petersburg, Russian Empire) was a Russian dramatist and actor.The tragic Vasily Karatygin (1802-1853) was his brother.Karatygin debuted on stage in 1823 and rose to fame performing in Alexander Griboyedov's "Woe from Wit" (the parts of Zagoretsky, Repetilov and, since 1831, Chatsky).In 1832-1838, as a head of the Drama department in the Saint Petersburg's Theatre College, he discovered and tutored several of the future Russian stage stars, including .Pyotr Karatygin wrote 68 plays, 53 of them vaudevilles, mostly elaborate variations on foreign plays and Russian novels.In the 1860s and 1870s he wrote a series of short memoirs on the history of the Russian theatre.Edited and previewed by his son, Pyotr Karatygin's "Notes" were serialized by "Russkaya Starina" in 1872-1879, to much critical acclaim. [SEP] Knowledge 2: Nikolai Rubinstein
Nikolai Grigoryevich Rubinstein was a Russian pianist, conductor, and composer.He was the younger brother of Anton Rubinstein and a close friend of Pyotr Ilyich Tchaikovsky.
Knowledge 1: Pyotr Karatygin
Pyotr Andreyevich Karatygin (11 July 1805, Saint Petersburg, Russian Empire, - 6 October 1879, Saint Petersburg, Russian Empire) was a Russian dramatist and actor.The tragic Vasily Karatygin (1802-1853) was his brother.Karatygin debuted on stage in 1823 and rose to fame performing in Alexander Griboyedov's "Woe from Wit" (the parts of Zagoretsky, Repetilov and, since 1831, Chatsky).In 1832-1838, as a head of the Drama department in the Saint Petersburg's Theatre College, he discovered and tutored several of the future Russian stage stars, including .Pyotr Karatygin wrote 68 plays, 53 of them vaudevilles, mostly elaborate variations on foreign plays and Russian novels.In the 1860s and 1870s he wrote a series of short memoirs on the history of the Russian theatre.Edited and previewed by his son, Pyotr Karatygin's "Notes" were serialized by "Russkaya Starina" in 1872-1879, to much critical acclaim. [SEP] Knowledge 2: Robert Vadra
Robert Vadra is an Indian businessman, entrepreneur and the husband of Priyanka Gandhi.He is the son -in- law of Sonia Gandhi and Rajiv Gandhi, and the brother- in- law of Rahul Gandhi.

Answer: Alexandra Kolosova