Mike:
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Below is the 1846 marriage record for Thomas and Honora. Also below is the 1851 baptismal record for Thomas Jr. http://registers.nli.ie/parishes/0268mas He also had a sister Ellen 1849, Maurice 1853 and William 1856. All in Hospital RC parish. There may be other children after 1856. Here is the link for the parish register for Hospital. http://registers.nli.ie/parishes/0268 The 1850 Griffiths Valuation head of household listing for Hospital civil parish shows a Thomas O'Brien in Millfarm townland. Possibly this is the senior Thomas.
Roger McDonnell
First name(s)HonoraLast nameBresnanAddressBallinscholaMarriage year1846Marriage date22 Feb 1846ParishHospitalAlternative parish namesHerbertstown, Hospital and HerbertstownDioceseCashel and EmlySpouse's first name(s)ThosSpouse's last nameO'BrienSpouse's addressBallinscholaCountyLimerickCountryIrelandRepositoryNational Library of IrelandNational Library of Ireland linkhttp://registers.nli.ie//registers/vtls000632731#page/1/mode/1up
Name:Thomas O'BrienDate of Birth:
Date of Baptism:21-May-1851Address:
Parish/District:HOSPITAL & HERBERTSTOWNGender:UnknownCountyCo. Limerick
Denomination:Roman Catholic
Father:Thomas O'BrienMother:Nora. BresnanOccupation:
Sponsor 1 /
Informant 1:Wm. DunworthSponsor 2 /
Informant 2:Cath. Neil