Martin Dwyer - Carnahallia, Doon and Castletown, Tipperary and Limerick, Ireland

I share DNA with Ellen Dwyer born in Ireland circa 1805. Ellen died in Carnahallia, Doon, Limerick circa 1875. I am hoping to learn if Ellen had a brother named Thomas. Thomas Dwyer and Mary Ryan had a son, Martin Dwyer who was born in Carnahallia in 1835 who I believe was my great-grandfather. Making this connection would confirm my belief. Thank you for any help you can give me, Peggy