Claim: Svetlana Alliluyeva was the youngest child and only daughter of Soviet leader Joseph Stalin and his second wife Nadezhda Alliluyeva, then in 1978, she became a naturalized citizen of the United States.
Evidence: Svetlana Iosifovna Alliluyeva (née Stalina) (Russian: Светла́на Ио́сифовна Аллилу́ева, Georgian: სვეტლანა იოსების ასული ალილუევა; Russian: Сталина; 28 February 1926 – 22 November 2011), later known as Lana Peters, was the youngest child and only daughter of Soviet leader Joseph Stalin and his second wife Nadezhda Alliluyeva. In 1967, she caused an international furor when she defected to, and in 1978 became a naturalized citizen of, the United States.