Sarelm on Family Tree Circles

I wish I could just get any hook on either of those gentlemen. I have very little to go on but for what it's worth here goes;
Thomas McKeon was born on 31/08/1867 to PAT (Patrick) and Mary (Nee Murray)McKeon in KILLNAGROSS Co Leitrim, Ireland. His brother Bernard was born 20/04/1872. I believe they left for Australia in 1900/1901 and never made contact with their family again. There was five other childern in the family 4 of whom emigrated to the Usa in the late eighteen hundreds. their names were Maria - John - Margaret - Eliza Ann and Catherine. Thomas was the eldest of the family and Catherine the youngest. She was my G grandmother - she was the only oneto remain in Ireland - married Thomas Ward in 1908 after both her parents were dead.
This is all the info I have - I spent almost all of the past year trying to access various lists for ships and marriages and what have you but with very little joy. I really have come to a stand still now and would really appreciate any suggestions on how to continue. I'm being joined from America by a group of mckeon decendents in 2011 eager to know all about Tom and Barney as he was know here as. Did they live into old age? did they marry? did they multiply?