There is no general "sibling sponsorship" stream in Canadian immigration the way there is for spouses or dependent children. Two things are worth separating:
- Having a sibling in Canada can help your Express Entry score. If you have a brother or sister who is a Canadian citizen or permanent resident living in Canada, this can earn you additional Comprehensive Ranking System (CRS) points — but this is a points boost within Express Entry, not a sponsorship pathway on its own.
- Direct sibling sponsorship (as a Family Class sponsorship) is only possible in narrow circumstances, specifically: the sibling being sponsored is an orphan, under the age of 22, and unmarried; OR the person doing the sponsoring has no other family member (spouse, dependent child, or parent) living with them, and is sponsoring the sibling to fill that gap.
Outside of those specific conditions, siblings cannot sponsor each other for PR the way a spouse or parent can. If you don't meet the narrow exception, look at whether the sibling relationship can instead boost your own Express Entry CRS score rather than assuming a direct sponsorship route exists.