Sarah Heagney(Kelly) Terry glass, Tip,died12. 12.1809

My 3x g/grandmother Sarah Kelly buried Terryglass cemetery D.12th December, 1809.Inscription by husband Martin Heagney. Wondering if Mary Heagney buried nearby 1774(headstone by father Thomas Heagney) are Martin's father and sister. Did Martin have so many sons it was necessary for son Patrick to take up farming in Bredagh town land, Lorrha?