Holdings-Potters in Michigan/Ohio

I am doing my family tree but have reached a dead end with my Grandmother, Bessie Potter, born sometime between 1875 and 1885. She married Richard Neal Holding b. Oct 1874 from Ohio. Their children were Robert Potter Holding (my father)b. June 3,1911 d. March 1967; and Jane Adele Holding b. ab.1914. Both children were born in Toledo, Ohio, East of the Maumee River where they resided. They later moved to Michigan were Robert met my mother Dorothy E. Wiederhoft, and married in 1936 in Ypsilanti, Michigan. I would greatly appreciate any leads anyone could give me. I have no info on her parents, siblings, birth date or place. She died before I was born of food poisoning. My grandfather´s father was Carlisle B. Holding, Methodist minister and writer, from Toledo, Ohio. Likewiswe, I am searching for info on him, dates of birth/death, wife´s name, etc.Thank you.
Carol