Help! View groups by Tax term but I don't know how to display Parent & Child labels...

Hi

I have a table view which lists a series of node belonging to a number of categories of a single vocabulary.

The table view is grouped by category/tax term (which is a field I load in the view but do not display). So the page looks roughly like this:

Cat/Tax Term 1
Node 1
Node 2
Node 3

Cat/Tax Term 2
Node 4
Node 5
Node 6

etc

The issue I have is that while some category terms are parents some are children (of sometimes diff parents), so when a child cat term is displayed as a grouping field its parent is not.

How do I display the parent term and the child term in the relevant instances?

Any help much appreciated.

Thanks