I research the Irish Family History Foundation's database. It contains 12,000,000 surviving rcds for abt 65% of Irish counties. Rcds are increasingly sparse B4 1840, rare B4 1800.
Note 1 - Without a KNOWN county, the chance of an ancestor's rcds NOT being in this database is AT LEAST 35%.
Note 2 - Only 1/2 of Co. Cork's rcds are in this database.
Note 3 - The RC church kept control over most parish rcds from Tipperary (north). These are ONLY available thru the Tipperary Family History Research center at a substantial fee (regardless of outcome).
For John McMorrow B 1865 (exact), Dromahaire parish, Co. Leitrim with a father forenamed Pat(rick), I found 1 rcd. A view of the detailed rcd SHOULD reveal the parent's name(s) and other info such as townland and/or residence.
Mary's parents are also likely Irish. Suggest you search Ohio censuses to find their DOB if they immigrated to the U.S. I can't easily search Ireland unless in have either DOB, or DOM.
Google the Foundation's name to lead you to this database. Register, opt to be notified as rcds are added and browse. Pls post your search results to my genforum msg.