William Bickle- calstock

trying to find out if thsi is my relation
listed as born 1826 living in calstock as widower 1871 census, with children george henry, ursula,josepha and james ( born 1866)
the 1901 census shows a james (same one) who could be our grandfather, with a wife jessie, and children john,annetta,
mary,laura and may.
However he is shown as a farmer, whereas dads birth certificate says quarry labourerand married to a mary!Same james remarried perhaps? Any ideas or info gratefully recieved