In the 1930 US Census, in Lansing, Ingham County, Michigan, I find:
Claude A Bennett 35
Velma L Bennett 32
Inez L Donovan 14Step Daughter
Russel A Donovan 12Step Son
Holl D Bennett 5[looks like "Holly" and a "6" on the actual census page]
Billie E Bennett 3 9/12
Alice J Bennett 2 7/12
Chester L Bennett 7/12
Lester R Bennett 7/12
Note: all were b. in MI, and all mothers and fathers were b. in Michigan.Claude was a bricklayer.
Interesting, "Age at first marriage" for Velma was "16." That would have been in about 1914.
Chester and Lester appear to be twins.
You might try finding the Bennett family in Michigan to see if you come across a fellow distant "step cousin" and who might know more.
I'm wondering if Vernon Donovan (other spellings: Donavan, O'Donovan, O'Donavan) may have entered the army in WWI and then became a casualty of war.He was a machinest and working for a "Car Co." and I find that interesting. This is only a hunch, but something that you might look into.I do not find him in any US Census by searching via Ancestry.com, even as a child in 1900, or later from 1910 to 1930, only where Velma had re-married in 1930 as listed above.Quite the difficult mystery.
Best regards.Sorry we were not more successful!
Jack Sheldon, CPA Mesa, AZ (formerly of Owosso, MI) Sheldon Family Assn. Inc., Asst Genealogist