Maloney's of Galway

My name is Jane Maloney Heffernan and I am looking for my father's family but I don't know the townland in County Galway. The following is all the information I have about them so far.

Denis Maloney married Margaret Murray ( no info on date or place) ( They are my great great grandparents).

They had at least 2 children: Peter Maloney (my great  grandfather) and  Mary A. Maloney.

Peter Maloney was born about July 1, 1845, died April 28, 1908 in Boston.  HIs sister Mary was born about 1849, died March 7, 1898 in Boston.

According to Peter's naturalization papers in the US, he came to Boston through New York about September 1, 1862. Not sure if his sister came with him at this time.

Peter Maloney married Sarah Gleeson or Gleason., born about August, 1846 in Ireland. I can't find their marriage record in the US or Ireland.

They had the following children in Boston / also lived lived across the Charles River from Boston in Charlestown, MA.

Dennis Francis Maloney - born August 16, 1868, married Mary McCarthy in 1889 in Boston, died Nov. 14, 1944 in Spokane, Washington, USA.

Joseph (H?) Maloney - born November 27, 1869

Peter J. Maloney - born January 12, 1871, married Catherine McCarthy in Boston on Jan. 22, 1871, died in Boston (Roxbury) October , 1945. These are my grandparents. They  had one child, my father, Richard Crandon Maloney, DDS. My father married Loretta T McHugh. I have one brother, Richard P Maloney.

Richard Maloney - born April 7, 1872, died July 23, 1872.

Thomas Joseph Maloney - born June 19, 1873

Mary Ann (F?) Maloney - born October 16, 1874, died about May 5, 1936.

Sarah Josephine Maloney - born March 1, 1876, died August 8, 1935, spouse Merton Hillman Fielder.

Michael Maloney - born July 17, 1878, died July 17, 1879

Helen Maloney - born about 1879 ( lived to be at least 30 yrs. old as she is in the 1880 US census, no record found of birth or death.

William Gregory Maloney - born June 22, 1880

Stephen Lawrence Maloney - born December 21, 1883.

My great great grandfather's sister Mary A. Maloney, born about 1849 married a William Goodwin Nov. 29, 1874 in Boston, died March 7, 1898. They had two children Mary Elizabeth born about 1878 and Margaret born about 1879.

Many thanks to anyone who can help me find them.

Jane Maloney Heffernan