I know a bit about the Braggs!

My grandmother was Pearl Verdie Bragg, b. 1915 New York.
She was not raised by her parents. She was raised in Maine. Census of 1930 shows her father as being born in Maine and mother was "Canada French". She had a sister, Dorithea (sp?) who was born approx 1921 in New Hampshire.
They are both listed as "granddaughter" in the 1930 census.

We heard stories from Dorithea's husband about the bullwhip tricks and tightrope walking that George Bragg did.
Hope this helps!