Sándor was born on March 12th, 1911 in Földes. Sándor's father was Gyula Körtvélyesi and his mother was Róza Nagy. His paternal grandparents were Ferenc Körtvélyesi and Róza Mészáros. He had a brother and three sisters, named Gyula, Róza, Teréz and Piroska. He was the second youngest of the five children. He died at the age of 61 in June 1972.