I am guessing that Novella was born about 1919, Robert around 1924, William about 1926, Marvin (no idea), Richard (no idea) and Edward in 1939.
I have dates for:
The infant who died at birth 11 Feb 1920
Ernest 18 May 1921
Ruby 18 May 1921
Sarah 21 Apr 1930
Give me you best guess or email he phone number(s) directly.
and Mary Lou 13 Apr 1932