Joe:
See second record for the 1890 civil marriage record for John and Teresa. John's father was Michael and he was deceased when they married. Teresa's father was Thomas Lawler and he was living. Looks like a brother John was a witness.
https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_re…
See second record for death of Michael Ryan, Family lived in Ballynamona townland in Ballynamona civil parish.
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_retu…
I assume that John was older when he married if his father died in 1876 at 75 and his mother was already deceased.
The RC parish would have been Hospital and Herbertstown. I searched the subscription site Roots Ireland and found a couple possibilities:
John Ryan baptized May 11 1846 father Michael Ryan mother Judith Creed
John Ryan baptized August 19 1849 father Michael Ryan mother Margaret Hurley
These two records would be leads.
Roger McDonnell