My experience has been that sometimes side tidbits eventually pay off. Below are some tidbits relating to a Rosborough family that came to New Brunswick, Canada from County Londonderry.
Robert Rosborough, long resident of 'Gass Alley' departed this life yesterday. The deceased was for a great number of years a resident of Fredericton city. By a life of honestry, industry and thrift, Mr. R. accummulated quite a fortune. He leaves a widow and a son, William Rosborough. The funeral takes place tomorrow 4 p.m. [The Fredericton Evening Capital, Fredericton, NB. 8 March 1884].
Margaret Rosborough, widow of Robt. Rosborough, mother of Ald. Wm Rosborough, died at her son's residence, Shore Street, 5 o'clock this morn. Mrs. Rosborough was born in County Derry, Ireland, 92 years ago. Her death was caused by old age. The funeral will take place Wednesday afternoon 2:30. Rev. Willard MacDonald will officiate at the house and grave. Geo. W. Adams has charge of the funeral arrangements. Mrs. Rosborough came to this country when 30 years of age and was married in St. Paul's Church, Fredericton city in 1866. Ald. Wm Rosborough is the only one of the family who survives Mrs. Rosborough
[The Gleaner, Fredericton, NB. 3 December 1894].
Ald. Rosborough, a descendant of the illustrious family who had charge of the old rock to which the booms were tied at the siege of Derry, arrived home last night from Halifax where he had been for the past week attending the Grand Orange Lodge of B.N.A. The Toronto 'Mail' correspondent says: Antiquarians among the Black Knights of Ireland will be interested in knowing that Wm Rosborough, Fredericton, N.B., one of the delegates, is a direct descendant of the family who owned the property on the Donegal side of the river where the boom was fastened at the time of the Siege of Derry [The Gleaner, Fredericton, NB. 3 August 1895].
d. Prince William (York Co.) Sabbath morn., 12th inst., William Rosborough, 84th year, native of County Derry, Ireland
[The Daily Telegraph, Saint John, NB. 25 January 1884].