I found George and Alice Roberts and their children in Lisgar, Manitoba on the 1911 census (
http://automatedgenealogy.com/census11/SplitView.jsp?id=45818 - last family on page 17) and in Duval, Saskatchewan on the 1916 census for Manitoba, Saskatchewan and Alberta. Also in Lisgar on the 1911 census are Robert and Clara Warne and their children (
http://automatedgenealogy.com/census11/SplitView.jsp?id=45818 - first family listed on page 18). Robert, Clara and family are also in Duval on the 1916 census.
There is a 1905 marriage for a Robert Warne to Clara Lewis in Middlesex County, Ontario that has a Mrs. Geo. Roberts listed as a witness however Robert lists his parents as Robert Warne and Alice Flynn(?) and says he was born in London, England. It is certainly possible he lied on the marriage registration because he didn't know the names of his parents or where he was born. Personally I've come across many marriage registrations that have wrong information for parents because the information either wasn't known or the person was hiding being illegitimate so I wouldn't rule this one out yet.
It appears Robert, Clara and family returned to Ontario. Robert and Clara are both listed as being buried at Mt Pleasant Cemetery in London, Ontario. Also, a couple of their daughters married in Ontario.
I found a picture of the grave marker for Robert and Clara Warne with one of their daughters also listed on it:
http://www.rootschat.com/links/0i2q/Here's a link to the search results for the name Warne for burials in Ontario:
http://www.rootschat.com/links/0i2r/It says there are 979 results but when you click on any of the links for pages 2 on of the results it changes to say there are 18 results only. Most of the results are for Mount Pleasant Cemetery and I did see some listings for the other children of Robert and Clara included.
Jacquie