How do I not report on parent row tasks from a project plan?

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I created a project plan where I created (for example) a parent row of "Day 1 Comms", and then created 2 children rows ("Develop comms" and "Approval of comms"). I assigned the 2 children row tasks to "Marketing" and added start and end dates that were in the past.

I created a report to see all "overdue tasks by dept" report. The report shows all 3 tasks- both the 2 children rows, and then also the parent row (which isn't a "task" but more of a category.)

How do I correctly report that there are only 2 tasks that are overdue (from the children rows), as the parent row is not a "task" but more of a category label?

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