The eldest surviving son of Chambré Brabazon, 5th Earl of Meath and Juliana Chaworth, he sat for County Dublin from 1713 to 1714 before being called up to the Irish House of Lords by writ in acceleration as Baron Ardee.
In the following year, he succeeded his father as Earl of Meath.
[1] As Earl, Chaworth presided over the building of the Earl of Meath's townhouse, 'Ardee House', in the Coombe in 1719, and which stood for over 200 years before being demolished in 1943.
[2][3] On 11 December 1731, he married Juliana (d. 12 December 1758), daughter of Sir Thomas Prendergast, 1st Baronet and Penelope Cadogan.
They had no children; when he died at Calais in 1763, he was succeeded by his brother Edward.