[2] Henry (called "Hal" in his youth) was born September 8, 1850, the first of what would eventually be six children, and their only son.
Cooper was a member of the Assembly in 1852, succeeding fellow Freesoiler Adam E. Ray.
The house into which they moved had been built by an abolitionist named Silas Peck, with features to help it serve as a station on the Underground Railroad.
Soon after the Coopers moved in, it was used to shelter fugitive slave Joshua Glover on his way to Canada.
[5] He died at his home in Burlington on September 4, 1893, having lived long enough to see his son (like him, a Republican) elected to the United States House of Representatives from their district on the previous November.