Commonwealth Family

The Commonwealth Family is a network of associations, organisations, and charities affiliated to the Commonwealth of Nations. Although associated with the Commonwealth, they are not fully a part of it, and membership is on a voluntary basis from within the membership of the Commonwealth. They are designed to advance the principles and policies of the Commonwealth itself.

In some cases, such as Sight Savers International and the English-Speaking Union, they operate outside the Commonwealth, but are still considered a part of the Commonwealth Family, as they still operate predominantly within the Commonwealth.

...
Wikipedia