John married Evelyn Leveson-Gower on 29 Jun 1744. Evelyn (daughter of John (1st Earl Gower) Leveson-Gower and Evelyn Pierrepont) was born on 26 Jan 1725; died on 14 Apr 1763. [Group Sheet] [Family Chart]

1. John FitzPatrick (2nd Earl of Upper Ossory) Fitzpatrick was born in 1745; died in 1818.
2. Hon Richard Fitzpatrick was born on 24 Jan 1748; died on 25 Apr 1813.
3. Lady Mary Fitzpatrick was born before 1751; died on 6 Oct 1778.
4. Lady Louisa Fitzpatrick was born in 1755; was christened on 7 Aug 1789; and died.