I added an action to one of the Child tables, and setup a reporting link expressly for the purpose of the Action. Then I added a Time stamp formula field to the child (using Now()) and a date/time field to the parent.
When a child record is added/modified, the action writes the time stamp from the Child to the date/time field on the parent, which then triggers my existing actions to go back the other way.
All these values are being used for security & controlling which users see which records, so I'm hesitant to change it. That said, the "out-and-back" method or "Double Action" method is working, so it's great for now. Thanks for letting me think aloud. Rick.
