I am probably not as far back as you, this is what I have so far.
BARTHOLOMEW FORRESTAL m. Anne LOFTUS ( married circa 1839- guessing) > Their children: 1. Thomas Forrestal (1840-1911)m.Bridget McDonnell ( my Great-Great Grandparents)Lancashire 2. Martin Forrestal (b.1842) 3. Patrick Forrestal (1844-1937)m Elizabeth Foster 4. Margaret Forrestal (b.1846) 5. Mary Forrestal (b. 1848) 6. Kitty Forrestal (b.1851) 7. James Forrestal (b. 1858) > > Thomas Forrestal was my Great-great Grandfather. I have more information. I have only recently heard about the possibility of James V Forrestal being from Lahardane. At the moment I can't find a connection between our lines - my Patrick seems to have married an Elizabeth Foster 10 June 1882.
Any more information you have on the Forrestals of Lahardane would be very much appreciated.