Descendants of Mary Nugent (Dennahy) and Patrick Nugent- Lismore

I’m the great granddaughter of Patrick Nugent who married Mary Dennahy and had 10 children. My grandmother Lizzie (Elizabeth) emigrated to the USA, but had several siblings who remained in Ireland- namely, Madge, Mary, and Kate. Madge married a Fennessy, Mary married a Hale and Kate married a Duggan. 
Im traveling with my family of 8 this October and plan to visit Lismore and Offaly. Would love to reconnect with 2nd or 3rd cousins in the area but have lost touch since the older generation has since died and last trips were in the 70’s and 80’s. 
Open to ideas to help track them down- thanks  Marybeth