The 1881 census for Canada is on www.familysearch.org There's a census link on the LH sideonce you get to the "search" page.You can't access the actual census scan, only the transcript. For the actual census scan, you'd have to order the census film through the LDS. Here's the info as it appears online. James C. BRADLEY M Male Irish 40 Nova Scotia FarmerCatholic Alice BRADLEY M Female French 29 Nova Scotia Catholic Maggie BRADLEYFemale Irish 11 Manitoba Going To SchoolCatholic Mary A. BRADLEY Female Irish 9 Manitoba Going To SchoolCatholic John BRADLEYMale French 7 Manitoba Going To SchoolCatholic Jeisie BRADLEY Female French 1 Manitoba Catholic Mary J. HEMLYFemale French 9 Manitoba Going To SchoolCatholic Source Information: Census PlaceDufferin, Marquette, Manitoba Family History Library Film1375919 NA Film NumberC-13283 District186 Sub-districtG Division2 Page Number15 Household Number94
There are 2 entries for a John C Bradley in the Western Land Grants - each at 4-8-W1 which appear to be somewhere between Altamont (5-8-W1) and Manitou (3-8-W1) Manitoba. See; http://geonames.nrcan.gc.ca/search/search_e.phphttp://geonames.nrcan.gc.ca/search/search_e.php to check out where these places are. You can open a little map once you search the place name.
The land entries are: NE1448W1 Cross-Reference RG:68 Liber:100 Folio:47 Date of document:1882/07/29 Names:JAMES C BRADLEY Remarks:160 ACRES HOMESTEAD SECRETARY OF STATE
NW1448W1 Cross-Reference RG:68 Liber:100 Folio:41 Date of document:1882/07/27 Names:JAMES C BRADLEY Remarks:160 ACRES N. W. M. P. SECRETARY OF STATE
With the above references you can order copies of their land records from the Manitoba Archives if you wish.
Unfortunately, civil regs didn't start in Manitoba until about 1882 so the only birth records for these children will be in parish or church records I think.
I'm afraid I can't help with much more- all of the family appears to have moved to N.D. by 1885 as you say.