Hi Patrick
Welcome to the site!
I couldn't find a birth/baptism record for James or Mary on www.rootsireland.ie/
The marriage is there but as you probably know it has very little information!
The 1821 Irish Censuses (free at http://www.census.nationalarchives.ie/) has a family of Conrans in Birr but no James
No luck with Temple in the censuses
Here's a record for a in Clonmanoise from Griffiths Valuation (free at http://www.askaboutireland.ie/) in 1854
Family Name 1TEMPLEForename 1JOHNLandlordFamily Name 2ROBBINSForename MONTGOMERYLocationCountyKING'SBaronyGARRYCASTLEUnionPARSONSTOWNParishCLONMACNOISETownlandTULLAGHBEGPlace NameTULLAGHBEGPlace TypeTOWNLANDPublication DetailsPosition on Page3Printing Date1854Act15&16Sheet Number5,6,13,14Map Reference4
There is one Conran - from Birr:
TenantFamily Name 1CONRANForename 1JOHNLandlordFamily Name 2BAGNALLForename 2JONATHANPrefixREPSLocationCountyKING'SBaronyBALLYBRITTUnionPARSONSTOWNParishBIRRTownlandTOWNPARKSPlace NameBACK LANEPlace TypeOTHERPublication DetailsPosition on Page33Printing Date1854Act15&16Sheet Number35Map Reference63 21
The only sibling for Kieran I found was John:
Name:John ConranDate of Birth:--1833
Date of Baptism:
Address:
Parish/District:ClonmacnoiseGender:
CountyCo. Offaly
Denomination:
Father:James ConranMother:Mary Temple
Col