How do I add a non-parent to a class distribution list?

On the Related People tab for each student record, update the relationship for the people who should be added to these distribution lists to "Guardian" and enable the "Receive General Correspondence" flag if it is not already checked. This will add them to the distribution lists so they receive all correspondence along with the student's parents.

After you create your composer email, select the "Receive General Correspondence" category from the Select Contacts With... dropdown menu on the Recipients screen.

More information about Parent Distribution Lists can be found here: