TThis Carbery O'Brien seems to have been Catholic gntry type.
Born Crenagh c. 1750 d. there 1807. Don't know his wife's name but they had 6 children. Marianne m. Edmund Scully 1806 Cornelius nothing known, Ellen . Denis Canny 1802 MMrgaret d. unm. 1827 Eliza M. Henry Mostyn of London in 1818. You can get the flavour from the following notice in the Limerick Chronicle of 1818.
On 10 July at seat of Denis Canny Deerpark Henry youngest son of Lord Tyhan and cousin of the Earl of Bloomsbury to EEliza O'Brien daughter of late Carbery O'Brien of Nenagh