Unless I'm losing my mind...and that is a good possibility that I am...
Didn't the Parent tasks under Hours have information from the Child tasks that roll up?

This Parent Tasks has Children Tasks from #12-103
I know I used to be able to click on the Parent Task, go to the Hours Tab and Group by Hour Entry by Week, Month, etc. to pull the info I need.
Something has changed.

I also have a Parent/Task report that is no longer working.
I do have a ticket in for this and the report that is not working.