Elizabeth's father was Benjamin Chellew, b. 1818 in Cornwall, England; her mother was Mary Hendra according to my research. Benjamin's father was Benjamin Chilew and his wife was Elizabeth.
This is from US census records, the knowledge of Chellew as a Cornish name. But they seemed to be in France for the 1841 census in Cornwall, and the 1910 us census says Mary immigrated in 1848, so they missed the 1851 English census.
I haven't found them in the 1850 US census, but the 1860 has them in Schulkill Co, PA under name Sholeu or Sholue-- the names fit. I hope this is helpful, and not misleading.