The only record seen that shows Catherine (aka Kate/Katie) as being born in Canada is the 1870 census, so this may be wrong. Son Herbert's marriage record lists Jerusalem as her birth place, perhaps more reliable than his death record, which says Lexington (which was his step-mother Estelle's birth place). Looking at the death records of her other children, Rosa's shows "unknown", while Emma's lists Skowhegan as Kate's birth place. 

No burial place has been found for Catherine (Young) Steward. Cemetery transcriptions of graveyards in Athens and Skowhegan have been searched, as well as all of those Somerset County cemeteries included in the Maine Old Cemetery Association (MOCA) records.

It is interesting to note that, in the 1870 census for Jerusalem, Franklin County, Maine, there are only five households in town (in 1860, there were 7, but 2 were unoccupied). One of those five households just happens to be a Young family. John Young, though himself listed as born in Maine, was also shown as having foreign born parents, just as Catherine (Young) Stewart was. Perhaps there is a link between them, though my research has yet to find one.

ADDENDUM, 2015
Since I began typing this blog, I also continued my search into these family members. In the past, I had searched high and low for those two girls (Mary and Sarah) that were only seen in the 1870 census. For many years, before we had the ability via Ancestry.com and Family Search to search for names, the family had been "lost" between 1860 and 1880, as myself and other researchers were always looking in Somerset County. It was in 2003 when I had found Thomas and his family in neighboring Franklin County, with two more names in the household we hadn't known about! Last night, trying again to find these Stewart girls, I lucked out. In the Mass VR, there is an 1897 marriage in Everett, MA between an Isaac W Bryden, Jr and a "May" F (Stewart) Crosgove, both a second marriage for them, both were listed "of Everett, age 30". She had been born in Skowhegan, the daughter of Thomas Stewart and Katie Young! 
Unfortunately, I have yet to find them in the 1900 census, and Isaac is afterwards seen in the 1902 Portland street directory, and remarries (listed as a widower) that same year. I haven't found May/Mary yet in a death record between 1897 to 1902.

ADDENDUM, 9/29/2016
Daughter Sarah has been found. Not sure how I previously missed her while doing blank searches for anyone with a Thomas Stewart/Steward and Catherine/Katherine (Young) for parents, but found her this time around. In 1907, a Sadie E Spaulding was married to an Arthur Woodman of Fairfield, and the above parents were listed. This marriage was listed as her second (in error), she being a widow. Her previous marriage was to William H Spaulding (6/27/1888 in Waterville, ME), whom she married shortly after her divorce from her first husband, Clarence Witham, was finalized. They had been married on 10/21/1883 in Embden, Maine, and they had a daughter Alice together. When Alice was married, she listed her mother as being born in Embden, which seems more likely the correct location, as compared to later accounts of her being born in Exeter, ME. Sadie, aka Sarah Etta, died in 1939, and was buried in Sunset Cemetery, North Anson, the same cemetery as her father. The Lewiston Daily Sun, 08/09/1939, printed an obituary for her.
​https://news.google.com/newspapers?id=xSQgAAAAIBAJ&sjid=gmoFAAAAIBAJ&pg=3377%2C2672070

My 4th Great-Grandfather, Alaxis Steward (aka Alexis Stewart), was born in Canaan, Maine on 4 Dec 1812, per town vital records. From 1850 to 1870, he and wife Charlotte (Harnden/Harding) are seen with their children in the Skowhegan, Maine censuses. After this latter date, and prior to 1880, they moved out west to Otter Tail County, Minnesota. It is currently not clear if the parents, with sons Phineas and Lucius, all packed up and left at the same time, but they were all together in the township of Compton by the 1880 census. The 1895 MN State Census lists both Phineas and Lucius as being residents here for 17 yrs, so they arrived ca 1878.

I have four ancestors, two each from my paternal and maternal sides, who served during the Civil War.

ISAAC CHARLES HAVEN PRIDHAM, born in New Castle, NH on 11 Sept 1847; died on 16 Apr 1924 in Brighton, MA. He was buried in Riverside Cemetery, New Castle.

Isaac enlisted for two years into the US Navy at Portsmouth, NH on 23 Sept 1864, and served for 20 months on board the Receiving Ship USS Vandalia, in Portsmouth Harbor. He worked as a landsman from Sept '64 to 1 Jan '65, as an ord. seaman to 31 Jan, and as a lamp cleaner to 18 May 1866, when he was discharged.

When he applied for a pension in 1892, he claimed he was born in Sept 1844, to correspond with the age of "20" he gave when he had enlisted back in 1864, when he had actually been only 17 years old. When he needed to send in a birth record to the pension dep't to verify his identity, he had to admit to falsifying his birth date. He still received a pension. 

See also: my blog page on the Pridham family:
http://www.mynewenglandancestors.com/1/post/2014/03/the-pridhams-of-puddle-dock-portsmouth-nh.html

JAMES WILLIAM BROWN was born 28 Dec 1841 in Kittery, Maine; died there on 5 May 1923. He was buried in Orchard Grove Cemetery, Kittery.

He served as a private in Company G, 27th Maine Infantry, enlisting at Kittery on 10 Sept 1862. He was mustered into US service at Portland, Maine on 30 Sept 1862, and served until 17 July 1863, when the regiment was mustered out at Portland.

(at right) James W Brown at his home in Locke's Cove, Kittery, on his way to a GAR convention in Washington, DC, likely the one in 1915 (the 49th Annual Encampment).

For more on the 27th Maine Infantry, please see my website:
www.the27thMaine.com 

THOMAS STEWARD (aka Stewart, Stuart), born abt 1838 in Skowhegan, Maine; died 22 Oct 1897 in Embden, Maine. He is buried in Sunset Cemetery, North Anson, Maine. 

He was drafted on 15 July 1863 at Skowhegan, ME, to serve in Co F, 7th Maine Infantry, but did not report for duty. He was arrested on 27 Jan 1864 and brought to camp, only for him to return home the next day. They arrested him again on 3 Feb. It is not clear in the records whether the recruits were still in Maine, but Private Steward deserted on 12 July '64, and was again arrested, on 23 July. He deserted a third time in August and was arrested a week later, this time being shipped to Carlisle, PA. By this time, the 7th Maine had been mustered out of service, except for later recruits and those who chose to re-enlist, and were transferred to the 1st Maine Veteran Infantry. The monthly muster rolls after this date would show him "absent, sick", right up to the muster out roll of the regiment on 28 June 1865. An affidavit in his pension file claims he suffered from scurvy, chronic diarrhea, piles and a trouble in the head, spending the entire winter quarters at Petersburg in the hospital. In the spring of 1865, he was transported to City Point Hospital. In the 1865 Maine Adjutant Report, it shows him being discharged on 2 July '65.

On the death record (17 July 1894 in Portsmouth, NH) of my second great-grandmother ELLEN (GRIFFIN) CONDON, it lists her parents as DENNIS GRIFFIN and ELLEN BOWLES. Both were born in Ireland, and her father was listed as a farmer. Her widowed mother lived with her and the family, as seen in the 1870 and 1880 Portsmouth census pages posted below. She died on 17 Dec 1889 in Portsmouth, and the death record gives her parents names as Patrick Bowler(sp) and Mary Shea, both born in Ireland.

When Ellen Griffin married John Condon in 1868, she listed her father as a laborer of Ireland. He is unnamed, and she did not list her mother on this record. Whether he was actually alive at this time is unclear. 

 Research has yet to find any other children of Patrick and Mary (Shea) Bowles who may have immigrated to the US. I have come across the same problem when trying to find any siblings of Ellen (Griffin) Condon.

The search continues.