Hello

Violet May is listed as Granddaughter of John and Jane Hitchings on 1901 census, at 5 Portland Street. John is listed as a tinplate manufacturer, and both John and Jane were 62 years old. Perhaps Violet May thought of her Grandfather as her Father if he brought her up.
J Hitchings was still a tenant at 38 Park Street in 1914, according to the 1914 Swansea Directory. He may have been running his tinware manufacture business from here, but is not stated in the directory as such. Some other addresses in the street are listed as businesses, e.g. tailor, W Evans & Son Grocers, Stables, etc.
If John was manufacturing tinware, products could have been things like saucepans and cooking utensils. If he was manufacturing tinplate, that would have been the raw material but I doubt he would be doing this "at Home" as described in 1901 census.
Kind Regards
Morgan