Jerry Casey m Mary A. Gallagher c1900; settled in Kilcruaig; looking for descendants

I am interested in any Gallagher descendants who settled in Houndscourt and Kilflyn. My 3rd ggrandfather Thomas Gallagher moved almost next door from Kildorrery, Cork, to Kilcruaig, Kilflyn, Limerick. When he died in 1825, his land was divided between his two sons Maurice and Terence Gallagher. They were all born before records were kept so I am still trying to learn who all of the siblings were in each family. Thomas's youngest son, Thomas, settled in Houndscourt. That family married, daughtered out, or remained single so in the early 1900's they disappeard from Houndscourt. I would like to learn more about the Kilflyn family as I think someone still owns the original property that was leased to the Drakes. This family would descend from the marriage of Jeremiah/Jerry Casey and Mary Gallagher. Jerry, son of Patrick Casey and Mary Ryan, was from Meadstown, Kildorrery, Cork. He married Mary Gallagher about 1900 and had the following children: Patrick Casey 1902, Thomas Casey 1902, Hannah Casey 1903, Margaret Casey 1905, Jeremiah Casey 1906, Mary Casey 1908, and Michael in 1910. I understand that Michael and Patrick became priests in the US. Looking at Cancelled Land records, a Margaret Casey held the land about 1950. I am wondering if there is a descendant of this family who might have information on early family. I am also interested in John Gallagher who was a National School teacher. He was apparently from either the Kilcruaig or the Houndscourt family. He was in Ballylanders in 1858, but I do not know how long he stayed there or where the family went after that. Thank you for any help. Jan