Question: Who is Andrey Markov Jr.'s uncle?
Sentence (from "Andrey Markov Jr."): (St. Petersburg, September 22, 1903 – Moscow, October 11, 1979) was a Soviet mathematician, the son of the Russian mathematician Andrey Andreyevich Markov Sr, and one of the key founders of the Russian school of constructive mathematics and logic.
Relevant evidence: No