If you agree that is your man, then you can:
use
https://www.irishgenealogy.ie/en/ to look for births to him and his wife - you mentioned she was Mary Brannigan earlier.
You just sign in to Irish genealogy and prove you are not a robot. It is really helpful.
You have children in the census in Leixlip so again you can look for their marriages and/or deaths on the same site.
There are newspaper snippets on FindMyPast for Irish newspapers which can be seen without membership where you may get hints.
I am not sure which business you refer to but hopefully if you look as above, you can see occupations on this records.
Christopher seems to have followed in the pub business but he died young.
Have you tried searching using your connection to the family first?
