You can do this using the following sets of steps.
First, you can create an Official Note template using the following steps:
1. Navigate to onBoard > Settings > Official Notes. 
1. Click +Add Template. 
1. Enter a description for the template, such as Re-enrollment Contract Letter 2016 | 2017. 
1. Use the User and Admission placeholders to compose a template letter. 
1. Click Save & Close.
Next, you can specify that an email be sent to the parent whenever an Official Note of this type is created:
1. From the Official Notes screen, click the edit pencil next to the appropriate Note Type. In this case, you chose Re-enrollment. 
1. Click on the name of the template you created, Re-enrollment Contract Letter 2016 | 2017, to add it to this note type. 
1. Verify that the Display, Required, and Email checkboxes are marked on the Parent of Candidate row. 
This means that whenever a note with this type is created, an email will be generated and sent to the Parent of the Candidate. 
1. Click Save & Close.