Question for EXPERTS here; Sponsoring Eligible Relatives

[peace4]

Note: you can sponsor one relative regardless of age or relationship only if you do not have a living spouse or common-law partner, conjugal partner, a son or daughter, parent, grandparent, sibling, uncle, aunt, nephew or niece who could be sponsored as a member of the family class, and you do not have any relative who is a Canadian citizen or a permanent resident or registered as an Indian under the Indian Act.

Above is a piece from Canada immigration website, about sponsoring a relative in a special circumstance.
I am confused about what it means

 

[matthewc]

Usually family class sponsorship are restricted to certain specific family relationships, usually spouses, partners, parents, and dependent children.

However, if you don't have any relatives in Canada, or anyone alive who you would otherwise be able to sponsor, then you are allowed to sponsor one relative (any relationship or age).

For example, if you have no relatives in Canada, no spouse, no children, and your parents and grandparents are dead, then you are allowed to sponsor your adult, married brother including his family as dependents. Usually you cannot sponsor a brother directly.

It's CIC's way of making sure you can sponsor someone if you have no family here.

 

[peace4]

Thanks MatthewC. I get it.
Don't you think such a situation would be extremely rare as uncles, aunts , nephews, nieces are also required to be non-existent.