Lancelot is listed on the 1911 census living in Muskoka on a farm with a family by the name of Randolph Hill. His attestation papers are found under the name of "Allinson" with Randolph Hill listed as the next of kin. He enlisted in Huntsville and his residence is listed as Hillsdale.He also married Edith Evelyn Thompson 23 Jun 1920 in Muskoka District.
Herbert is listed on the 1911 census as "Herbet" Allison b.1896, arrival 1908 living, with a family by the name of Umphrey in Ontario North, Scott Township. He (sp Allenson)later marries Gwendolyn Constance Clarice Whitehouse Feb 9 1916 in Hamilton Ontario (Wentworth County). His attestation papers are under Herbert Allinson Reg #240583 with the wife listed as "Gurendolyn".
I have found there were many boys placed in the Muskoka and surrounding districts. They were not far apart..I wonder if they knew where each other was. I haven't looked for children.
Some of the variances appear to be transcription errors but it seems both boys adopted the "N", perhaps in defense , there were many Allisons! Scarboro, Yorkshire seems to be their origin.
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Enough of the details compute to make these both very likely yours..best of luck.!
Kiddo