Okay, so the primary search is for parents and siblings of Henry Smitheram b. 1838 and wife Bolinda Ann Taylor b 1844 of Cornwall, England. Is Cornwall the full place name? Is there anything more you can say about Henry and Bolinda? How did you get all their children's names - did you find this family in a census in Cornwall? Other records? This couple did not immigrate to USA, as I understand you to say.
I am probably not going to be of much help in a search for a family in England. But others who can help will want to know as much as you can tell. Perhaps a post in the England forum?
Again, I really like your Find-a-Grave memorial - especially the photos - very touching.