In the 1920 Census Jack and Mary don't have children listed
so I did my research using birth years and first names I came up with the Osbornes which fit -I'm not saying this your family but it is a possible:
I did some more checking and found birth dates for Alvin & Adam
Children of FRANKLIN OSBORN and MAUDA GARRISON :
ADAM VICTOR OSBORN, b. May 20, 1914, Enid, Montana;

ALVIN LEWIS OSBORN, b. February 15, 1916, Enid, Montana;