My mother was Jean Doris Hemmer Smith of Rochester, NY and Florida (b. 1918 d. 1995). Her father was Peter Adolph Hemmer, originally from Dansville, NY and Rochester, NY (b. approx. 1888 d. 1968). Peter Hemmer had 3 sisters, Mary, Betty, and Theresa.A family reunion was held some time in the early 1960's to which many Rochester area relattions attended.
Jean Hemmer Smith had one sister Doris J. Hemmer Sheridan, also of Rochester (d. approx 1964).Three children, Paul, David, and Susan.
A distant relative traced family history to Germany, I think (perhaps eroneously, to Darmstadt, Hesse.
The correspondent was born in Rochester, and now resides in Northern California.