My ancestors Mary Ahern b.1790 and Jeremiah Falvey b.1786 - died 1870 Indiana, USA, married

My grandmother was Mary Catherine Falvey who grew up in the charming small town of Winamac, Indiana. She was descended from immigrants Mark Daniel Falvey, born1827 County Kerry, I now think might have been on the Dingle Peninsula, possibly Tralee. No hard proof. His parents also emigrated from Kerry, Jeremiah Falvey born 1786, and wife nee Mary Ahern born 1790. Mark D. and Jeremiah are buried (along with 25 other Falveys) in the St. Peter's Catholic Cemetery in Winamac, Indiana,  a church which Mark supposedly started in his living room in the 1850's.Mark's brother Patrick J. Falvey born 1840 also took the boat and went to wild west Kansas where he had a harder time of it.  Their graves as well as my great-grandfather's, James M. Falvey, a Notre Dame graduate, b. IN,  and railroad stationmaster in Winamac,  are all on Find a Grave. However I do not know exactly where in Kerry most of these ancestors were born, or definitively who their parents were. Mary's parents are listed in an onliine family tree  as Cornelius Ahearn and Nora McCarthy, no place or dates, so estimated birth might be1785 or so. I do not know where she died and is buried and it might be in Ireland. . Any tips on researching them, also a Mary Sullivan I posted as an ancestor born 1795, greatly appreciated. I read Donnie O'Sullivan's comments and will try out those. About 150 Falvey cousins over here mainly in Florida and Indiana follow all this! I am retired and can doggedly pursue leads.Thanks.

April in Virginia