Bloomz allows the teacher to set the class options for the visibility of parents and students. 

Parent to Parent Communication:

Turning this feature OFF will:

• Hide the parent list in the class for other parents
• Parents can only message teacher
• Parents can only post to teacher
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Follow the steps below to adjust the class options:

• Click the For All Groups menu to the left of the screen
  
• Select the Class from the Filter by Class
• Click the Settings wheel icon at the top of the screen
• Choose Edit Settings from Class Options
• Click Features tab 
• Turn On/OFF the Parent-Parent Communication toggle button
• Click Save