Sándor was born on January 16th, 1889 in Ada and his baptism took place there on January 16th, 1889.12 Sándor's father was Mátyás Körtvélyesi and his mother was Erzsébet Hugyik. He had two brothers and three sisters, named János, Ignác, <Unknown>, Viktória and Róza. He was the third youngest of the six children.