I am tracking my Simmons family descendants. So far, I have found my great grandparents: Clyde Allen Simmons and Effie M. Simmons. Clyde was born on 11/24/1882 and Effie M. Simmons was born in 1886. I don't know her maiden name. They had four children: Vivian: 1912, Glen: 1910, Twins--Thelma and Velma: 1906. Please help me with resources to use. They lived in Sheridan County, Nebraska.