I started the following, but haven't had time to continue it. it may be useful.
Thomas.
Actually, the 1901 census of Chatham Parish, Northumberland Co., NB states that the widow, Mrs. Ellen Monahan b. 7MAY1843, was born in Quebec, was Irish and ran a boarding house. Her son was Wm Donahee (29JUL1873) with a wife, Margaret (21APR1875) and children, Joseph (10JAN1896), Ellen (26DEC1897), Bertha (28FEB1900) and Henry (28FEB1901). The birth–dates given in the 1901 census are often unreliable. According to birth records (Georgina Aurora Donahee b. Chatham Parish, Northumberland Co., NB 10FEB1902 for example) William’s wife was Margaret (Maggie) McLean or Margaret ‘Grames’ (Mary Ellen Donahee b. Chatham Parish 27NOV1897; note the difference from the birth-date in 1901). However, this may not be the same Ellen, Margaret and William as a William Donahue of Chatham Parish had a wife, Margaret Graham. William Donahee (b. Bathurst, NB ca. 1873) did not name his parents when he married Chatham Parish, Northumberland Co., NB 28AUG1895 Maggie Grames (b. Richibucto, Kent Co., NB ca. 1873), d/o James and Eliza (Whitney) Grames. He was, like William Donahee in 1901, a shoemaker. So Maggie Grames may have been a 1st wife and Margaret McLean a 2nd wife. Joseph Donahee, when he married York Co., NB 30JUN1917 Vera May Taylor only gave his parents as William and Margaret Donahee. Bertha Donahee, when she m. St. Mary’s Parish 7JUN1929 John Lowell McLaughlin, gave her parents as William and Margaret (McLean) Donahee. As near as I can figure Margaret McLean and Margaret Grames/Graham were the same person.
In 1910, William and Margaret (McLean) Donahee were in Northesk Parish, Northumberland Co., NB when a daughter, Sarah Donahee, was b. 16FEB1910. William was living in Marysville, St. Mary’s Parish, York Co., NB, in 1942, when he attested to the birth of his son, William Donahee b. Bridgetown, Northumberland Co., NB 30JUN1913. The mother was given as Margaret M’Lean, an archaic yet correct spelling. Bertha (28FEB1900 in 1901) was Elizabeth Bertha Stella Donahee b. Chatham Parish 28JAN1900; again indicating the inaccuracy of the 1901 census. Margaret May ‘Donahue’ (b. Strathadam, Northumberland Co., NB 10MAR1907 was the daughter of William and Margaret (McLean) ‘Donahue’, and apparently worked in the cotton mills in Marysville as her sister, Mrs. Mary E. Daley, lived in Marysville in 1968 when she attested to Margaret’s birth and Margaret was a mill worker.
Ellen Monahan b. Gaspé, Québec ca. 1842, d. Newcastle Parish, Northumberland Co., NB 26DEC1912 age 70 years as the result of an injury. Her death record suggests that her maiden name was Donahee, but this may be a reference to a previous marriage.
In 1891, in Chatham Parish, Charles Monaghan (b. Prince Edward Island ca. 1851, parents b. Ireland) was a shoemaker. His wife is given as Mary Ann (b. Québec ca. 1843, parents b. Québec). With them was William ‘Donaghee’ b. Québec ca. 1871, parents b. Québec, also a shoemaker. William is given as a lodger, but it seems that Mary Ann was actually Ellen, so Charles’ stepson.
In 1881, in Chatham Parish, Charles Monaghan (37) and presumably a brother, Peter Monaghan (23), both b. PEI, were shoemakers and unmarried.
The 1911 seems to be more a matter of fiction than of fact. Even the parish they were in is doubtful. The census appears to be of Chatham Parish but the heading states that it was Northesk Parish. William Donahee (variously transcribed as ‘Donaha’ and ‘Donahue’) (JUL1874) is given as b. in ‘Portannal?’ Ellen Donahee (MAY1847, age 64) is given as arrived in 1831. Her place-of-birth is difficult to read. Something that looks like ‘Perisie’ (Percé?) was crossed out and something that might be read as ‘Frances’ written in, but I really doubt that she was ever in France.
Variations of the name Donahee are found in Percé Co., such as Thomas ‘Donoghue’ (49) in 1881. There was, in Montreal in 1881, a William ‘Donohue’ (b. Québec ca. 1837) with a wife whose name is given as ‘Allen?’ (b. Québec ca. 1844) with children James (21), ‘Hellen’ (19), Matilda (18), Mary (11), William (8), Clara (6) and Eva (2). ‘Allen’ was French where William, a merchant, was Irish. I would be reluctant to suggest that this was the family you sought, but there do not seem to be many alternatives so far.