Andrei Nikolaevich Kolmogorov was born on April 12 (April 25 in a new style) in 1903 in Tambov, where his mother stayed on the way from the Crimea home to Yaroslavl. Kolmogorov's mother, Maria Yakovlevna Kolmogorova (1871-1903), daughter of the leader of the Uglich nobility, trustee of public schools of the Yaroslavl province, Yakov Stepanovich Kolmogorov, died in childbirth.
Father - Nikolai Matveyevich Kataev, an agronomist by training (he graduated from the Moscow Agricultural Institute), belonged to the right-wing Socialist Revolutionary Party, was exiled (from St. Petersburg) for participating in the populist movement in Yaroslavl province, where he met Maria Yakovlevna. Died in 1919 during the Denikin offensive. The paternal grandfather was a village priest in the Vyatka province (now Kirov Oblast).