George Henry was institutionalized at the New York State Asylum for Idiots
in/near Syracuse. He is mentioned in Lyman's will. The 1880 census lists
him as unable to read or write, but in school.
However, in 1892, there's a George Stearns, age 30, living with George W. Cook and
family, and working as a fireman (the steam engine kind). Then in 1905, there
is a married George W. Stearns, a RR Engineer, and on the same page a John Cook
a fireman. Could be a coincidence.