Gábor was born on October 1st, 1848 in Földes. Gábor's father was Gábor Körtvélyesi and his mother was Júlia Ványi. His paternal grandparents were Ferenc Körtvélyesi and Sára Sápi. He had a brother and a sister, named Körtvélyesi and Julianna. He was the oldest of the three children. He had a half-sister named Ágnes. He died at the age of 4 on April 20th, 1853 in Földes.