Looking for Parents of Calvin Alan Coffey

Calvin (I believe) was born in Grainger County, Tenn., served with the 69th Tennessee during the Civil War. Was captured at Vicksburg and paroled (later re-joined). After the war, he moved to Indiana, married Josephine Simmonds. Was a school teacher and farmer. Children, Walter Castella Coffey, Joel Simmonds Coffey (b. 1885), and several others.

Any help is appreciated.