Sándor was born in 1873 in Sáp.1 Sándor's father was Mihály Körtvélyesi and his mother was Zsuzsanna Jámbor. His paternal grandparents were József Körtvélyesi and Rebeka Ritók. He had a brother named Gyula. He was the older of the two children. He died by commiting suicide, akasztás, at the age of 25 on February 22nd, 1898 in Sáp.1