István's father was Péter Kossa and his mother is <Unknown>. His paternal grandfather was György Kossa and his paternal grandmother is <Unknown>. He had two half-brothers named Péter and József. István is no longer alive.
General Notes
1754-ben Abán összeírnak egy Pétert https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSLT-S342-T?i=12&cat=53524