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David & Eliza Jane were born in Ireland. Sarah was from what I know their first child born in Scotland and this is what I have for Sarah's birth:
1857 Births in the Parish of Kirkcolm in the County of Wigtown, page 1
Surname & Name: Rainey, Sarah
When & Where Born: 1856 December Fifteenth, 8 h pm Balquharrie, Kirkcolm
Sex: F
Name, Surname & Rank or Profession of Father: Samuel Rainey, labourer
Name & Maiden Surname of Mother: Mary Rainey maiden name Brown
Signature, Qualification & Residence of Informant if out of the house when Birth occured: Samuel Rainey his X mark father not present, Arch McKinney registrar witness
When & Where Registered & Signature: 1857 January 3 at Kirkcolm, Arch McKinney Registrar.

Some good finds on his regiment.

The John Russell on the 1871 census was recorded as born in England. The age on the census could be off, would need his birth record or a marriage saying possibly a minor. This John is living in Quebec City where there is a garrison in 1871. The Saint Patrick Parish that Bridget Russell m.s. Ready was a sponsor was in Quebec City and the baptism was on May 22, 1872.  The article mentioned they were camped in N.S. in the summers for musket practice. I’ve looked for a marriage and births on the Nova Scotia vital statistics site for births for Robert & Margaret Russell in N.S. and didn’t find any. I would suggest a look at the Acadia birth records on Ancestry for a Robert or Margaret’s birth to find the name of the father. I don’t subscribe to Ancestry.

From the National Archives Canada site it also confirms the 1871 wrapping up of military service in Canada.
The British government stationed British Army regiments in Canada for its defense from the close of the Seven Years' War (1763) until 1871. Generally, these forces were garrisoned in fortifications such as those found in Quebec, Kingston and Halifax and could be augmented from time to time by reinforcements from Britain in response to war scares, rebellion and war itself. As well, a permanent fleet base was maintained in Halifax for the Royal Navy.
In the late 1860s, the British government decided that as colonial governments were now responsible for governing their own territory, they should also be responsible for their own defense.
By 1871, all British garrisons had been removed, either returning to Britain or sent to duty in other Imperial outposts. Their places were taken by a new Canadian Permanent Force, at first composed of only two batteries of artillery, and later expanded to include other elements such as cavalry and infantry. These were to be supplemented by militia units in emergencies.
http://bit.ly/2rF36jv

I didn’t see an 1871 census for a Bridget Ready in Quebec. The N.S. one is a possibility for Bridget Russell if she is m.s. Ready and seems older with children born in NS. If not I was wondering if Ready may be Rodey. Literacy was a problem. Something to consider. Would need to find the marriage record.

Bridgitt Rodey Ireland 17 servant
http://data2.collectionscanada.ca/1871/jpg/4395452_00521.jpg

John Russell’s marriage was most likely at the Quebec garrison. On ancestry, there are marriages indexed for Garnison de Quebec (registres) 1797-1826, should be Garrison de Quebec. I would look for where the garrison marriage records are for 1871  timeframe as if age 17 is correct. We don’t find a marriage in Saint Patrick in 1871 or 1872 and the other record for Bridget found by Jacquie had her in Quebec on May 22, 1872.

If the Garrison records were sent back  to England, the British arhives has foreign birth, marriage and death registers (RG 32-RG 36) and download records are available on The Genealogist and Ancestry websites or can  be browsed at The National Archives series (or class) and piece number or description. I don’t subscribe to Ancestry. If you do, these are the files I would suggest you search of browse:
UK Foreign and Overseas Registers of British Subjects, 1628-1969
RG34. Miscellaneous Foreign Marriges 1826-1921:
   Piece 1: … Marriages 1826-1870
   Piece 2: … Marriages 1871-1896
I would check for a birth of John Ready Russell in the Acadia records or possibly here:
RG32: Miscellaneous Foreign Returns
  Piece 1: … Returns 1831-1870
and if John died in Canada before his wife (a widow in 1880) you could check for a death here for him:
UK Foreign and Overseas Registers of British Subjects, 1628-1969
RG 35: Miscellaneous Foreign Deaths, 1830-1921
  Pieces 20 - 21

A corporal is basically the next step from a private. It isn’t of the status of an officer, so I could see a corporal of a young age.

There is the McFarlane with military connections:

D. McFarlane is Joint Magistrate serving in Monghyr, India (letters dated 1820-1821)
West Bengal district records; new series. Murshidabad Nizamut: letters issued:pt.1 (1802/31).
https://hdl.handle.net/2027/umn.31951d00963299w

D. McFarlane, Chief M. [Magistrate] & Mity B. [Military Board] at Fort William per letter dated 26 Feb 1839
(Fort William is a fort in Calcutta, India)
See pages 387 and 401
West Bengal district records; new series. Murshidabad Nizamut: letters receivd:pt.2 (1807/55).
https://hdl.handle.net/2027/umn.31951d00963301z

That sounds good. I found there is a George Forbes on the 1916 census that immigrated in 1911, in March before Edith. George was born Scotland. Does this match the one that lived near Edith? Good to get the marriage record to be sure.

1916 Canada Census
http://www.bac-lac.gc.ca/eng/census/1916/Pages/item.aspx?itemid=313273

1911 Immigration record, George Forbes immigrating to Edmonton
http://www.bac-lac.gc.ca/eng/discover/immigration/immigration-records/passenger-lists/passenger-lists-quebec-port-1865-1900/Pages/item.aspx?IdNumber=3020870&

May be G.H. Foster

There is a marriage in Winnipeg, Manitoba for Ethel Stott and George H. Foster
DATE OF MARRIAGE: 31/05/1911
PLACE OF MARRIAGE: WPG
REGISTRATION NUMBER: 1911,005631

One article posted by bbart above mentions they recently moved from  Winnipeg and were married 2 years.
You can purchase a certificate: http://vitalstats.gov.mb.ca/Query.php