In order to acomplish this, build a new advanced list with this structure:
Note: When adding to a distribution group, make sure to select to include User base [1] so that you email the parents
 

Select Objects:

  • Community Base 
    (from category: Community Group)
    • Community Group Detail 
       (from category: Community Group)
      • Community Group Member 
         (from category: Community Group)
        • User Base 
          (from category: Constituent Information)
          • User Role
            (from category: Constituent Information) 
          • Parent/Child Relationship
            (from category: Constituent Information) 
            • User Base [1]
              (from category: Constituent Information) 

 

Global Filters:

Where - User Role.Role - Any of: Student

And - Parent/Child Relationship.List As Parent - is True

And - Community Base.Community Title - Contains: [Insert the name of the community group here]

 

Display Fields:

User Base [1].First Name (Parent First name)

User Base [1].Last Name (Parent Last Name)

User Base [1].Email (Parent Email)

User Base.First Name (Student First name)

User Base.Last Name (Student Last Name)