I can see your tree online and I can see how hard it is for you with all the incorrect spelling of the family surname.
I can see the 1881 Census where Pierre says that he was married ~ could he have fibbed ?
The 1891 Census then has him as a widower.
Just so you now, the Irish civil registration only began in 1864 so prior to that you are looking for Church Baptisms.
For that you need father's name, mother's name and maiden name, and an exact parish then to see if records still exists for that area.
I'm afraid that at the moment you have none of these which means your Irish search needs to halt for now.
There has been great success though on this site and hopefully a relation shall read this and get in touch with LOTS of information.
Fingers Crossed

Tara