Stalin's second wife was Nadezhda Alliluyeva; theirs was not an easy relationship, and they often fought. They had two biological children—a son, Vasily, and a daughter, Svetlana—and adopted another son, Artyom Sergeev, in 1921. During his marriage to Nadezhda, Stalin had affairs with many other women, most of whom were fellow revolutionaries or their wives. Nadezdha suspected that this was the case, and committed suicide in 1932. Stalin regarded Vasily as spoiled and often chastised his behaviour; as Stalin's son, Vasily nevertheless was swiftly promoted through the ranks of the Red Army and allowed a lavish lifestyle. Conversely, Stalin had an affectionate relationship with Svetlana during her childhood, and was also very fond of Artyom. In later life, he disapproved of Svetlana's various suitors and husbands, putting a strain on his relationship with her. After the Second World War, he made little time for his children and his family played a decreasingly important role in his life. After Stalin's death, Svetlana changed her surname from Stalin to Allilueva, and defected to the U.S.