Alexander "Sandy" Blakes born c1846 was a butcher and lived in the townaldn of Gorran. Wife Sarah Jane Donnelly born c1851.
Coleraine Chronicle, 22 Jan.1910: "Notice: Sandy Blake, Gorran, Begs to intimate to his Customers and the public that he is carrying on the business of Flesher and Butcher at Gorran. All Orders entrusted to him will have prompt and careful attention."
Son Robert Blakes, Limavady, m.Oct.1910 Margaret "Maggie" McLean (although she seems to have gone by a variety of names).
his son Samuel married Letitia Trolan - no marriage in NI indexes - they jhad one son John born 1905 - moved to Scotland married and died there.
Think you might have this bit wrong. Letitia Blakes, daughter of Sandy and Sarah Jane, married 24 Nov.1909 Main St. (2nd) Presbyterian Church, Garvagh to William James Smyth. However, her son John Blakes, born 31 July 1905, bapt. 9 Oct.1905 at Main St. Presbyterian Church, was the illegitiamte son of Samuel Trolan.
Will look up 1901 census and post it here if you wish.