How to automate user as 'watcher' to parent tasks when made assignee of subtasks/tasks/child issue

[Catherine Plant]

Hello! I need to ensure all assignees of tasks / subtasks / child issues are notified of comments added to the parent task (whether Epic or task). 

At first, I was looking for this option ('notify assignee of task / sub task / child issue when comment is added to parent') but then realized it might be better to write it as 'when assignee is added to task and the task has a parent, make assignee watcher of the parent task.

1. is this the best path (confirming all 'watchers' are notified of comments left on a task).

2. I'm not finding the best way to write this as an automation rule. Can anyone support, please? 

Many thanks in advance!

[Anandhi Arumugam _Cprime_ · Accepted solution]

Hi @Catherine Plant Something like this should work. 

[Catherine Plant]

Thank you so much @Anandhi Arumugam _Cprime_ ! This worked beautifully. I am grateful to you. 

[Anandhi Arumugam _Cprime_]

Glad it worked for you! Please accept the answer :)