No relation.
Don't think this is yours.
The death registration I found for a Harry John Swartz with father William born in Holland, mother not given but b York England, died 26 March 1927 at Hamilton General Hospital, blacksmith, b 17 Sept 1858, burial: Cayuga, informant: son David Swartz of Cayuga.
Registration # 035913.
That is the only death I could find on Ancestry.ca
Harry J Swartz, 46, b and living Moulton, blacksmith, s/o William Swartz & Fanny Batty married Maria Morrison, 54, d/o Albert Crumb & Nancy Crumb. 24 Sept 1904 at Haldimand.
Births:
Wm Swartz, b 28 Dec 1894, s/o Harry Swartz & Emma McIntee. Moulton Haldimand.
1881 census Moulton
SWARTZ
Harry, 23, Methodist
Emma, 19
Jane, 2
Fanny, 9/12 b September
Name: Emma McIntee
Age: 15
Birth Date: abt 1863
Birth Place: Louth Ontario
Marriage Date: 27 Nov 1878
Marriage County or District: Haldimand
Father: James McIntee
Mother: Sarah McIntee
Spouse: Harry Swartz
Spouse's Age: 21
Spouse Birth Date: abt 1857
Spouse Birth Place: Monlton Ontario
Spouse Father: William Swartz
Spouse Mother: Frances Swartz
Emma Swartz
Gender: Female
Birth Year: abt 1862
Birth Place: Canada
Age at Death: 40
Death Date: 12 Oct 1902
Death Place: Welland, Ontario, Canada
1861 census Haldimand
SWARTS
William, b Upper Canada, 47
Frances, 37
Emily,19
William, 16
Clara, 14
Jessie, 11
Clark, 7
Whitaker, 5
Harry J, 4
1871 census Monck gives Francis' birth place as Ontario.
Also more children - Lucy 9 and Alice 8.
Jesse, Clark, Whitticar and Henry are also with their mother.
So now 9 children are identified.
1891 census says both parents of Harry John born in Ontario.
Francis Swartz, 19, b Dunnville, d/o Harry Swartz and Emma McIntee, married Edgar Clark, 19, s/o Albert Clark & Susan Tice, 24 May 1900, Welland County.
Harry J Swartz, died 18 July 1885, infant, hit by car, father Harry Swartz. Moulton Haldimand.
Jesse Swartz died 25 Feb 1937. His death registration gives father as William Swartz born Alsace-Lorraine, mother Fanny Battye b England. son Walter was informant.
Whittaker Swartz, died 7 Sept 1926. Says both parents b Canada.
Births listed on Ancestry of child/ren of Harry John and Emma are:
Wm, b 28 Dec 1894
Thomas, 1892
David, 29 Jun 1887
Peter Alonzo, 29 March 1896
Children of above on 1901 census
Jennie A, 16
Fanny, 14
Jesse, 13
David, 12
Arthur, 10
Thomas, 8
Grace, 4
Albert, 2