Hi Alison,
I don't know who Michael's parents were. It may have been John Greer, who was listed with Michael and William Greer in the Tithe Applotment records. I have't found a birth record for him yet. Michael was a farmer in Leaffoney.
While searching, I did find some death registrations for a Greer family that was stationed in Enniscrone at the coastguard station there. Elizabeth (53), wife of Robert Greer a coastguard pensioner, died December 16, 1897. Fanny E. (14), daughter of Robert Greer, died Mar 21, 1897. Robert Greer (61), a coast guard pensioner, died Sept 26, 1900, and Alfred Greer (14), son of Robert Greer, died Oct 6, 1900. The last two were witnessed/reported by Robert and Elizabeth's daughter Louisa Greer. This was all in Enniscrone, Castleconnor district, Dromore West Union, County Sligo.
I don't believe this family is related, but who knows?
Annie