Unmarking sub task should unmark the parent task

Can you guys add this feature:

Please unmark parent task when sub task is unmarked.

Thanks.

Can you describe a use case please? I have trouble seeing how this good play well, especially when you have multiple subtasks…

I have two subtasks that I have completed. I mark the parent task as completed, naturally. But when evaluated, I notice that one of the subtask has not completely done (I missed some points), so I mark that back as incomplete. But the parent task is still completed.

That is clear. Product Feedback is the right place for this request, people will be able to vote for it!