G'day Mary -
In addition to the data Brian has been able to provide you with, and Colbert's entry in the ET site, Senan Molony's excellent and groundbreaking work The Irish Aboard Titanic (Wolfhound Press, Dublin, 2000 ISBN: 0-86327-805-1) has a full page entry on this third class passenger. If you would like to email me privately, I can give you Sen's email address (might have trouble getting an immediate response, though - as of Easter Sunday, the inimitable Molony is a father again for the second time and has his mind occupied with more immediate things, although he's still talking ship matters).
Colbert's entry describes how he was emigrating to Canada to become a religious brother, and apparently had quite a sum of money with him.
Colbert was born 5 November 1887. The 1901 census entry for the family has his parents as John Colbert (56) Kate (50), and children still at home as Michael (25), Honora (23), Denis (19), Timothy (18), Margaret (16), Daniel (14) and Patrick (11).
Apparently the Colbert family shared land with a group of cousins.