Party Relationship: display also PArent Data

My customer wants to use The Party Relationship applet to display the realtionship betwenn Contact/Account and Account/Contact

On the standard, I can display only the ''child relationship'' associated to a contact/account.

The customer wants display, in the same Party relationship applet, the parent relationship too, and want to add a new column to describe if this account/contact is a child o is the parent for the selected current record (the record selected on the tree)

Definetively, it wants to represent the tree, (displayed on the Tree applet), on the party relationship list applet, including also the parent record.