Freddie was born in 1860. He is the son of Isaac Derby.
Sources
"New Hampshire Death Records, 1654-1947," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FSKT-Q5C : 10 March 2018), Frederick W Derby, 10 Nov 1860; citing , Bureau Vital Records and Health Statistics, Concord; FHL microfilm 1,001,073.
"New Hampshire Birth Records, Early to 1900," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FLLV-4Q2 : 10 March 2018), Fred Derby, 07 Sep 1860; citing Westmoreland, Cheshire, New Hampshire, United States, Bureau of Vital Records and Health Statistics, Concord; FHL microfilm 1,000,496.
"New Hampshire Birth Records, Early to 1900," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FLLV-44X : 10 March 2018), Frederick Derby, 07 Sep 1860; citing Westmoreland, Cheshire, New Hampshire, United States, Bureau of Vital Records and Health Statistics, Concord; FHL microfilm 1,000,496.