Sándor was born on September 11th, 1856. Sándor's father was Ádám Nagy and his mother was Rozália Buza. His paternal grandparents were János Nagy and Judit Kovács. He had two brothers and two sisters, named Pál, István, Anna and Zsófia. He was the second oldest of the five children. He died at just 23 days old on October 4th, 1856 in Téthszentkút, Győr vm.1