Thomas O'Grady was a brother of Standish O'Grady, 1st Viscount Guillamore. His eldest son was Standish Thomas O'Grady of Landscape, parish of Kiltenanlea, barony of Tulla Lower, county Clare and his fourth son was James Smith O'Grady who married Mary, daughter of Berkeley Vincent of Summerhill, a nearby residence. Another son, Capt. Robert Dring O'Grady, owned land in the barony of Coshmore and Coshbride in county Waterford which he appears to have purchased in 1853. He died in 1862 and the trustees offered the property for sale in the Landed Estates Court in January 1865. In the 1870s Gilbert O'Grady of Landscape owned 63 acres in county Clare and and 1,488 acres in county Limerick. This O'Grady estate was in the parishes of Hospital, barony of Smallcounty and Mahoonagh, barony of Glenquin, county Limerick.