thomas joseph kavanagh

I am trying to trace the ancestors of my Grandfather Thomas Joseph Kavanagh, He married Georgina Morgan, who was the daughter of William Morgan and Margaret Doolittle from Wicklow,
I think my Grandfather also came from around the Wicklow area, He would of been born aroun 1870-1875,
He was a Ships rigger and spent most of his working life at sea
He may of had a number of siblings but I dont know of any at all, except that there is a Samuel Kavanagh and a James Kavanagh mentioned,and I believe they married Ellen Reynolds and Catherine Doolittle, so if there is anyone who could lead us to other avenues I would be very grateful
Gina Ellis