Fair point. I have no data, but assume that's a minority of immigrants.
Also, there are some requirements to support those family members:
"You will also sign a Sponsorship Agreement, obligating you to financially support your sponsored relatives if they cant provide for their own needs. The new permanent resident will not qualify for government assistance, even after the sponsored person becomes a permanent resident, separates from you, or leaves the country."
"To sponsor a parent or grandparent, you must obligate yourself for 20 years of financial support."
Also, there are some requirements to support those family members:
"You will also sign a Sponsorship Agreement, obligating you to financially support your sponsored relatives if they cant provide for their own needs. The new permanent resident will not qualify for government assistance, even after the sponsored person becomes a permanent resident, separates from you, or leaves the country."
"To sponsor a parent or grandparent, you must obligate yourself for 20 years of financial support."
https://greenlightcanada.com/how-much-does-it-cost-to-sponso...