The seven extensions represent a soul group that teach lessons and serve as life guides for each other. They can be identified by looking at those people who either help you or hurt you the most.
The ones that hurt you the most, take on this difficult role from a place of pure love and subconsciously feel hurt when teaching you a lesson. It can be far easier to play the role of a supportive grandmother than it is to play the role of a disapproving parent. Both roles are extremely important to your growth.
In the illustration below, you can see the relationship between twin flames and their extensions. Each plays a different role but their common goal is to lift the soul group towards happiness.