Married Mary Kennedy – as Richard FitzGerald and Mary Kennedy are listed as parents on the baptismal record of Edward the engraver (1758–1834) at St Michan's RC in Dublin.
He was contemperary with the Hon Richard Fitzgerald, brother of the 19th Earl of Kildare (and therefore son of 18th Earl of Kildare). Although our Richard was himself a descendant of the Earls of Kildare (and therefore related to the Dukes of Leinster), as Roman Catholics his family would have had to be estranged from James the 1st Duke of Leinster, who, when this English title was invented in 1766, would have been required to be of a 100% protestant family or lose his rights to the title.
Richard had a brother, Christopher, who married Mary FitzPatrick, who wrote out her family history in a notebook so that - according to our grandfather George William Joseph - so that her family history was not forgotten. There was a title in her family which could only be inherited by a male. Our grandfather could have claimed this title as he was the first male heir in the family.
Christopher and Richard lived in the home in now in Dorset street, formerly called Drumcondra, bought when the houses there were brand spanking new and on the edge of the posh end of town. At the time it was normal for the priest to go to the homes of babies to baptise them, and the christening bowl inherited by my older sister would have been from this home.
Richard and Christopher could well be the two "unknown FitzGerald"s listed in Lord Edward FitzGerald's official family tree - unidentified because they remained Catholic.