First, congratulations on finding a grgrgrgrandparent! (That's further back than I can go.) Unfortunately, it will be hard to find a baptismal record for Denis around 1819-24. Bleanmore is in Kilmurry McMahon RC parish, and baptismal records don't start there until 1845. It's just across the Shannon from Ballybunnion, but baptismal records don't start there until 1831. (Though he was living in Bleanmore, he might have been born in Ballybunnion.) You might have better luck finding his death, assuming he survived the Famine and stayed in Ireland. Abbeyfeale is in Newcastle registration district and the death index on familysearch.org shows at least five possible Denis Collins deaths in Newcastle: 1803-83, 1813-83, 1818-81, 1820-96, and 1822-92. If you send to the GRO with dates, volumes, and page numbers, it's 4 euros each for the registrations, which would give you place of death and informant. Unfortunately, the Griffith's index shows dozens of Collins families in Abbeyfeale, including 4 for Denis Collins, so unless you know his townland, it would be hard to know if any of them were yours. Diane