I looked @ the 1850 & 1860 US Census , for the Township of Kirkland & New Hartford NY @ The Rochester Public Library and found nothing listed for the family of "McCue".
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The 1870 US Census for the Town of Kirkland, Post Office of Clinton
Information from Rochester Public Library....on August 31, 1998:

McCue, Mary, age 37, = b. 1833, occupation: Keeping House, born Ireland
McCue, Mary, age 12, = b. 1858, born: New York State
McCue, Sarah, age 8, = b. 1862, born: New York State
McCue, Margaret, age 5, = b. 1865, born: New York State
McCue, Francis, Male, age 2, = b. 1868, born: New York State

Where is James McCue he would have been 16 years old in 1875 ?
Mary's husband John died in 1868...2 years before census.

So this Mother of 5 children must have been known to the Wholahan Family, for they were living in the same Town & probably going to the same Catholic Church, St. Mary's in Clinton..
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Because Michael was reported to have died in New Hartford, NY, I looked @ the 1880 US Census
for Oneida County, New Hartford, NY, on Roll-902, #T9, Page 25, #367 @ Rochester Public Library and found the following information on August 31, 1998:

Mrs. Wholahan, age 50, Widowed, occupation: Keeping House, born in Ireland, Parents born Ireland
Mary Morrill ?, age 22, Daughter, occupation: Keeping House, born in NY, Parents born Ireland
Sarah Wholahan, age 18, Daughter, occ:: Works in Cotton Mill, born in NY, Parents born Ireland
Margaret Wholahan, age 15, Daughter, occ:: Works in Cotton Mill, born in NY, Parents born Ireland
Frank Wholahan, age 13, Son, occ:: Works in Cotton Mill, born in NY, Parents born Ireland

This must be Mary McCue of Kirkland, for the childrens names are the same, but Mary's age is listed as 50 when it should have been 47...or did they round off the age numbers ?
and the last names of the children cannot be Wholahan....if the 1870 Census is correct.
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Did she marry Michael @ Saint Francis DeSales Church in Utica and then they combined families & set up house in New Hartford with Michael working @ a new Cotton Mill ?.......for I found the Gooney Family living in New Hartford....so I assume this is where Sarah moved to & met Michael Gooney here in New Hartford ? Did Mary Ann meet the Marley's here ? So they must have moved before 1880....this is why Sarah was married in Saint Francis DeSales Church in Utica.
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I found the following information while looking at a Utica City Directory when I visited the Utica Public Library for the first time in Thursday June 4 1998, & second time on June 22, 1998.
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1880, 1881, 1882.....no record of a Wholahan
1883 Wholahan, Mary Mrs........................... rooms @ 52 Fay Street
1884 Wholahan, Mary Mrs........................... rooms @ 18 Chenengo Ave.
1885 Wholahan, Mary Mrs........................... rooms @ 1 Kossuth Ave.
Wholahan, Mary.Occupation, Operative rooms @ 1 Kossuth Ave.
1886, 1887, 1888.....no record of a Wholahan
1889 Wholahan, Mary Mrs........................... rooms @ 14 Kossuth Ave.
1890 Wholahan, Mary Mrs........................... rooms @ 237 Jay Street
1891 Wholahan, Mary widow of Michael........ home @ 237 Jay Street
1892 Wholahan, Mary widow of Michael........ home @ 445 Jay Street
1893 Wholahan, Mary widow of Michael........ home @ 445 Jay Street
1894....No Record
1895....No Record
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The note "Widow of Michael" ...was startling!
This was my first indication that Michael had remarried after Ann's death in 1869.
I will order the Soundex Micro-Film from the Mormon Center to check NYS for Wholahans in 1900
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August 1998:
The following data came from the 1900 Census-Sound Index: W450
US Census New York: Vol #195, E.D. #66, sheet #8, Line #85

Wholahan, Mary, White, born: August 1833, 66 years old, Birthplace: Ireland
County: Oneida, Utica Town, City: Utica, Street: Mary
Enumerated with............Casey, Matthew
Relationship to above Mother-in-Law

So now I was getting closer to the mystery of Mame Casey relationship.
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In the 1900 US Census for NY State, Oneida County, City of Utica, Eighth Ward, the following:

Wholahan, Mary, Mother-in-Law to Matthew Casey, Born Aug. 1833, 66 years old
a Widow, gave birth to 8 children, 5 children now living, imigrated in 1850, 50 years in US
Born in Ireland, + Father & Mother born in Ireland
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