Lord Clancarty had already been created a baronet in the Baronetage of Nova Scotia in c. 1638, before he succeeded his father in the viscountcy.

Charles, Lord Clancarty died as an infant and was succeeded by his uncle Callaghan MacCarty, the third Earl.

His son and heir apparent Robert MacCarty, Viscount Muskerry, served as Governor of Newfoundland but was excepted from the Indemnity Act 1747, which pardoned Jacobites.

[6] Lord Clancarty's great-grandson, the fifth Earl, is notable for marrying an English music-hall singer Belle Bilton (1867–1906)[7] in July 1889 against the opposition of his father who sold off much of the estate in retaliation.

William Le Poer Trench, fourth son of the first Earl, was a Rear-Admiral in the Royal Navy.

Sir Robert Le Poer Trench, ninth son of the first Earl, was a Colonel in the Army and a Knight Commander of the Order of the Bath.

William Le Poer Trench, third son of the third Earl, was a Colonel in the Royal Engineers and briefly represented County Galway in the House of Commons.

When the will was opened it was found that [the 4th Earl] had left everything he possibly could away from his oldest son and heir, with whom he had been at daggers drawn since the divorce suit.

The possession of the entailed estates, however, was sufficient to relieve Lady Dunlo, who had now become Countess of Clancarty, from any further necessity of remaining on the stage.

Lord and Lady Clancarty have now four sons, the oldest of them twins, and a girl of eleven years of age.