Babysitter during wedding at Markree Castle for a baby and 4 year old

My brother is getting married at Markree Castle on 7/7/26. I will be staying overnight in the castle with my husband and 7 month old baby boy. We are traveling from the U.S. and we are in the wedding. We will need a babysitter for the day into the night for our baby boy and our 4 year old niece. We will be checking in on the kids periodically throughout the day.