Looking for Penhall Family Ancesters IN Cornwall UK and Ontario Canada

My great grandparents were Rev. William PENHALL and Eliza HUNT of southwest Ontario, Canada. The HUNT's are related to the SIFTON family. I found Penhall parents of William(born 1852) in the 1881 Census in Cornwall,UK. His Father was also a William PENHALL,a miner in St. Austell Downs and his mother was Caroline STEVENS. I'm now searching back for their families.