I have a student grid that I would like parents to have access to. The relationship from the parent to the student is in the connections table and is set to Primary Contact. How do I create the security on the contact view using this relationship?

I have a student grid that I would like parents to have access to. The relationship from the parent to the student is in the connections table and is set to Primary Contact. How do I create the security on the contact view using this relationship?