Try each of the following steps in order until the issue is resolved:
  1. Ensure the appropriate relationship types and filters are selected in the Set Up Integration tab
  2. Check the filters on The Linking grid
  3. Check the relationships on the family records
  4. Verify in Set Up Integration that there are Student Relationships set to be add as Constituents
  5. For more information, see How to set up Integration with The Raiser's Edge (includes demo)