Bertha would have been my half Great Aunt on my Dad's side. That is a sticky part of the family tree, as John R Simmerman was Bertha's step brother.
He was the son of Coonrod (Conrad) Simmerman and his first wife Mary. Coonrod and Nancy then married after Arnold Gasser's death and they had 4 children together.
Bertha, Elizabeth and Colista were the children of Arnold & Nancy Gasser while John R was the son of Coonrod and Mary.
I hope I haven't confused you too much.
John and Bertha's children were Clara, Jacob, John and Cora.
Please contact me if you would like discuss names and dates further.