Henry became deaf and dumb at the age of about 6 months - probably as a result of measles.
In 1881 Henry is shown as a boarder at the St Johns Roman Catholic Institute for the Deaf and Dumb. I have obtained a record from St John's which says he was admitted in 1879 (when he was 5) and discharged in 1888.
St John's Roman Catholic Institute for the Deaf and Dumb
This was set up in the 1870s. One of the benefactors was the Marquis of Bute