Can I use the "Target Parent/Guardians" feature of Composer to email former parents?

No — The "Target Parent/Guardians" feature in Composer only looks for relatives of current students and excludes anyone who is classified as a former parent. To target former parents and guardians:

  1. Navigate to the System homepage and run a Find Relationships query.
  2. Search for former students or alumni. 
  3. Add the Person ID for their parents.
  4. Set the related person role to filter the results to only the people who should receive the communication.