John Henry Pepper - Pepper's Ghost

[Robert Gray]

Where could I find information on the family of John Henry Pepper (b. 17 June 1821 in Westminster – d. 25 March 1900 in Leytonstone). I think his father was Charles Bailey Pepper.

Also was his sister Jane Adelaide Pepper and did she marry Richard Wheeler Thomas of 10 Pall Mall, who was a London chemist who specialized in the production and sale of photographic supplies?

Any leads welcome