If Kilkenny is on your itinerary, take a look at Lawcus Farm Guesthouse. http://www.lawcusfarmguesthouse.com/
The farm animals are sure to entertain the children; host Mark will enlist them for help at feeding time. I would also expect there to be at least one baby lamb on site; my wife couldn't wait to bottle feed "Lamborghini" each morning during our 2018 visit. Anne-Marie's breakfasts are amazing. Kilkenny is an easy 15 minute drive from Lawcus (in Stoneyford). Kilkenny is a walkable town with a tourist "train" that would probably be fun. Can't think of much else that would amuse the kids (well, we did enjoy excellent ice cream at a shop on the main drag.) Stoneyford itself is small and quiet, with at least one pub that had live music one night while we were there. Anne-Marie might have leads on babysitters if you inquire.
This link will take you to a YouTube video of the guesthouse and grounds: https://www.youtube.com/watch?v=kssaZ9VnrwY