For the Federal Government, the 2012 Low Income cut-off for Canada Sponsorship of parents and grandparents:
Effective from January 1 to December 31 2012
Low Income Cut-Off (LICO)
Size of Family Unit Minimum necessary income
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1 person (the sponsor) $22,637
2 persons $28,182
3 persons $34,646
4 persons $42,065
5 persons $47,710
6 persons $53,808
7 persons $59,907
More than 7 persons, for each additional person, add $6,099
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about more detail please read cic official site.