Therese:
Welcome to Ireland Reaching Out!
Here is the parish register for Bagenelstown https://registers.nli.ie/parishes/0703
I checked the subscription site Roots Ireland and there were actually five children. I also located the parents April 8, 1832 marriage record. See transcriptions below.
Roger McDonnell
Name:Andrew MulronyDate of Birth:
Date of Baptism:17-May-1833Address:BagnalestownParish/District:BAGENALSTOWNGender:
CountyCo. Carlow
Denomination:Roman Catholic
Father:James MulronyMother:Mary KellyOccupation:
Sponsor 1 /
Informant 1:John Nolan Sponsor 2 /
Informant 2:Mary Nolan
Name:Mary MulronyDate of Birth:
Date of Baptism:11-May-1834Address:B. TownParish/District:BAGENALSTOWNGender:
CountyCo. Carlow
Denomination:Roman Catholic
Father:James MulronyMother:Mary KellyOccupation:
Sponsor 1 /
Informant 1:Edward Maher Sponsor 2 /
Informant 2:Anne Headon
Name:Catherine MulroonyDate of Birth:
Date of Baptism:01-Jan-1836Address:BagnalstownParish/District:BAGENALSTOWNGender:
CountyCo. Carlow
Denomination:Roman Catholic
Father:James MulroonyMother:Mary KellyOccupation:
Sponsor 1 /
Informant 1:William Ward Sponsor 2 /
Informant 2:Mary Bardon
Name:Bridget MulroneyDate of Birth:
Date of Baptism:01-Aug-1841Address:BagnelstownParish/District:BAGENALSTOWNGender:
CountyCo. Carlow
Denomination:Roman Catholic
Father:James MulroneyMother:Mary KellyOccupation:
Sponsor 1 /
Informant 1:William Tracey Sponsor 2 /
Informant 2:Bridget Moran
Name:Elizabeth MulroneyDate of Birth:
Date of Baptism:20-Dec-1845Address:BagenalstownParish/District:BAGENALSTOWNGender:
CountyCo. Carlow
Denomination:Roman Catholic
Father:James MulroneyMother:Mary KellyOccupation:
Sponsor 1 /
Informant 1:Patrick Gorman Sponsor 2 /
Informant 2:Margaret Doran
Date of Marriage:08-Apr-1832
Parish / District:Bagenalstown
County:Co. Carlow
Husband JamesMulrowny
Wife MaryKelly