Looking for Mccosker Mccusker of Australia and Ireland

I am descended from Bernard and Ellen Mccosker of Australia. I have a lot of info on the Mccoskers here but I'd like to know more about Bernards parents Cornelius Mccusker and Catherine Donnelly and his brothers. I have info on Patrick but not alot on Francis, John, James and Hugh.

I've pretty much figured out the rest of the family but have hit a dead end with the above names so can anyone help me solve the next piece to the puzzle.

Thankyou.