John was a twin of Thomas Lambe according to the LDS information.  Both were born and baptised the same dates.

Ontario, Canada Deaths, 1869-1934 about John Lamb
Name: John Lamb Death Date: Oct 1924 Death Location: Grey Gender: Male Estimated Birth Year: abt 1840 Birth Location: England #014297
John's date of birth on his death is given as Nov. 10, 1839 with his parents listed as father ? Lamb and mother Christina Steadman.  He was buried in Lakeview Cemetery, Meaford on Oct. 16, 1924.  The undertaker, A. Helstrop, was the informant.