Yep…
Create a Reusable Element (RE) with the same content type as your RG (i.e. ‘Client’)…
Add a text element to that RE to display the Parent Group’s Client’s Name
Add a Group Focus to the RE with the content type of Client, and datasource of Parent Group’s Client, and add whatever you want to display inside it.
Create two workflows… 1 to Show the Group Focus when the Name is hovered, and 1 to hide it when the Name is no longer hovered.
Make sure the RE is only as tall as the text element inside it (don’t worry about the GroupFocus, that will still display)
Then just add that RE to the RG, and set the datasource to the current cell’s Client.