Hi, You are searching for information about
George Callup NELSON b aprox 1918-1920
Frank NELSON b. Aprox 1917-1919
At Drumheller Alberta.
What information do you already have other than what you have posted? eg. Family rumour etc.
Search 1916 Census on Ancestry for Nelson Surname.
Note: some public libraries subscribe to Ancestry -search at no cost at most locations.
Registration of Birth for your Father - Obtain from the Govt of Alberta Vital Statistics Registry Office - may show the names of the parents. - Place of birth of parents.
Did your father,brother and Grandfather continue to live in Drumheller?
When? Where? was your father Married ?
REGISTRATION of Marriage - should show names of his father and mother including the mothers maiden name]
Where did your father and Frank NELSON settle?
Do you know When? Where your grandfather passed away?