Other than the 1851 Census and the marriage license for Philander S. This is all I found on Lewis. I assume you know his wife's name was Amy also.
Name: Lewis Bush Age: 53 Estimated Birth Year: abt 1818 Gender: Male Birth Place: Ontario
Residence District: Leeds South Residence Location: Bastard, South Burgess Ethnic Origin: German Religion: Methodist Occupation: Iron Founder Division: 2 Microfilm Roll: C-10002 Page: 64 Head of Household Comment: This person is listed as a head of household.
Ontario, Canada Deaths, 1869-1934 Ontario, Canada Deaths, 1869-1934 Name: Lewis Bush Death Date: 31 Jul 1898 Death Location: Leeds Gender: Male Estimated Birth Year: abt 1818 Birth Location: Bastard