Quigley family

Greetings..

I am searching for my Great Grandmother's family.  Genevieve Quigley (nickname Jennie.. ) was born approximately 21 June 1882.. Her sister Katherine was born approximately  5 July 1879..  They also had a brother named John.  I have Genevieve's marriage certificate that lists her parents as Owen Quigley and Catherine Dempsey.   I don't have a copy of the letter, but a cousin mentioned that a letter from John's daughter Mary had the following address: "Mary's address was Buckfield then something that looked like Yenty and Roscommon, Ireland "..

Any information you have on the family would be greatly appreciated..

Thank you ..

Linda