Report - Only show parent if there is a child

I have a report that shows work items from Epics to Stories.

I have the parent-child relationship set up and it works well.

However, I added a parameter that limits the stories, but the reports displays all the epics. Is there a technique that will not display the epic if there are no stories related to it after limiting the stories by a parameter?

I'm thinking if there is a way of having a filter based on number of (or if there are) displayed children.

Thanks...