Sverdlov was born in Nizhny Novgorod as Yakov-Aaron Mikhailovich Sverdlov to Jewish parents, Mikhail Izrailevich Sverdlov and Elizaveta Solomonova. His father was a politically active engraver who produced forged documents and stored arms for the revolutionary underground. The Sverdlov family had six children: two daughters (Sophia and Sara) and four sons (Zinovy, Yakov, Veniamin, and Lev). After his wife's death in 1900, Mikhail converted with his family to the Russian Orthodox Church, married Maria Aleksandrovna Kormiltseva, and had two more sons, Herman and Alexander. Sverdlov's father was sympathetic to his children's socialist tendencies and 5 out of his 6 children would become involved in revolutionary politics at some point. Mikhail watched as his household slowly became a revolutionary hotspot, where the Novgorod Social Democrats would meet, write pamphlets, and even forge stamps for false passports. Yakov's eldest brother Zinovy was adopted by Maxim Gorky, who was a frequent guest at the house. Zinovy was the only Sverdlov to reject revolutionary politics and had little to no contact with Yakov after the revolution.