Roger and Shanew147,
Thank you for your assistance. I was doing some research today on my great, great grandmother, Catherine Ennis, and I came across a baptismal list with her parent's names dated 21 April 1808. It looks like their names may have been mispelled. Her father was listed as Patrick Ennisy and her mother was listed as Catherine Grinnan, not Grennan. The name of the parish was not listed but I believe they were from Co. Wexford. It looks like the baptism was for Henry Ennis, probably Catherine's brother. Listed as sponsor was Bryan Ennisy.
Richard and Catherine Heffernan emigrated to the US in 1849 but I'm sure they had family remaining in Ireland.
I will continue searching with the clues you have given me. I have been trying to plan a trip to Ireland but, as with everyone else, I have had to deal with the restrictions that Covid has presented. I'm hoping that I will have enough information on extended family to enable me to located them when I do arrive.
Thanks again for all your hard work!