I have an Ellen Fahey who married Peter Gill somewhere in Pennsylvania (possibly Luzerne County). Ellen Fahey Gill died in San Diego in 1953. According to her California death record she was born in Pennsylvania in 1864 to Thomas and Ellen Carney Fahey.
The report of her funeral in 1953 indicated that she was a sister of Sarah Doran and John Fahey.
Could Ellen Fahey Gill be a sister of your Thomas Fahey?