I believe that Charles Eader was my great grandfather. My grandfather was Charles Lewis Eader b. 1884. His siblings were as you have listed. Charles passed away when my father Morris Laverne Eader was only 6 years old. Charles left behind the following children:
Lewis Eader, Herman Eader, - born of Dorothy
Joyce Eader (Berkowski), Dennis Eader, Morris Eader, Delores (Laurie) Eader (Colebank), and Nelson Eader - born of Mildred.
Charles married Dorothy and when she passed away he married Mildred Camp Brown Eader (Yeager). Mildred passed away in 1991.
Charles and Mildred have together over 54 grandchildren and nearly 80 great grandchildren.

I look forward to hearing from you. You said in your post you were a related from the 1770's. I would love to see or know more about this.

Anita Marie Eader, b 1976