I've recently begun research on my mother's family and ran across your post. My grandfather, Patrick Sheridan (born John Joseph) grew up in Rathlee. His father's name was Michael Sheridan and his mother's Belinda Cullen. If my research is correct Belinda's grandmother's name was Bridget Brennan from Sligo.
I think Michael's father, also Patrick, may have been born in Kilglass possibly to Michael Sheridan and Mary McGuire but this is only speculation at this point as I don't have any definitive proof that this is the case. Anything spark??