While looking at results in the People Manager you can use the Group Member icons to see details about other members linked to the member in question:
Primary Member Profile
This icon will appear for secondary and tertiary members. Clicking it takes you to the primary member’s Profile screen.
Secondary & Tertiary Members
This icon will appear for a primary member that has secondary and/or tertiary members defined under the primary membership. Clicking it displays a popup list of these members, to jump to a specific member’s Profile screen.