I believe I found them in 1911.
1911 STRATHCONA, ALBERTA
John, age 69, farmer, born July1842 England
Hannah, age 69, wife, born July 1842 England
Amander, age 9, granddaughter, born Aug. 1902 Manitoba
William, age 20, farmer, born Sept. 1891, ON
John James, age 40, farmer, born July 1871 ON
Susan, age 38, wife, born Dec. 1873 ON
Joseph S., age 16, son, born March 1895 ON
Rose, age 14, son,born March 1897 ON
Clifford, age 12, son born July, 1899 ON
Theresa,age 11, daughter,born April 1900 MAN
Thomas, age 4 , son, born April 1907 MAN
Bertha, age 2, daughter, born Nov. 1909 MAN
Bella, age 9/12, daughter, born Sept. 1910 Alberta
so it may be that they went to Alberta to be with son or sons and then later moved back to MAN
I looked for births of any of these children in MAN and there is a Margaret Amanda Dallyn born Aug. 29, 1901 Gilbert Plains, - mother Annie Emily Bowie, father's name not shown, but mother shown as married
Theresa Hannah Mary Dallyn born April 15, 1900 R.M. of South Norfolk, mother Susan Ward, marriedfather's name not shown
Thomas Kinsley Dallyn April 8, 1907 Gilbert Plains, mother Susan Ward, married, father's name not shown
I didn't find Bertha , but that may be a nickname ?
There is also a birth for an Alice Freda May 2, 1903 Gilbert Plains, mother Susan Ward, married - Alice Freda died Aug. 25, 1901 Gilbert Plains age 3 months
I found the Oct. 1892 marriage for John Dallyn and Susan Ward in ON which shows his parents as John Dallyn and Hannah M. Prout so this does seem to match to be their son s- seems to also confirm this is the right John and Hannah in 1911.
There is also an ON1898 marriage for a Wm. George Dallyn to Annie Bawhey (could this be Annie Emily Bowie -mother of Amanda ?) Wm.'s parents shown a John Dallyn and Hanna Prout.
This WM. born about 1871 while the one in 1911 census born about 1891 so not same fellow unless age is wrong somewhere.
There is a birth to fit him - shown as son of Ambrose Dallyn and Ellen Ward
born Sept. 29, 1890
Ambrose married Ellen Ward in 1889 in ON - he was another son of John and Hannahand it seems that Susan Ward and Ellen Ward were sisters.