To pull this into a list, you can select a list template such as Parents who are also Teachers or Non-Teaching Staff and go to:
  1. Filters
  2. Remove the User Role.Role(1) is Non-Teaching Staff by clicking the gray x
  3. Change the User Role.Role(1) is Teacher to is Parent of Incoming Student and remove the extra parenthesis in front of it.
Now when you run this list, it will give you users who have the Parent role and Parent of Incoming Student role.