Pull Request 518 is an update Gary Burton created for the GraphView add-on view mode. This update has just been released through the Addon Manager.
So check for updated addons now.
A new context menu option in the Charts category GraphView mode allows the view to show the path to the common ancestors of the Home Person and the indicated person.
So, right-clicking on the Duke of Edinburgh on a chart with Queen Elizabeth II as Home Person, shows the this context menu.
Selecting “Show path to home person” changes the view to show how these third cousins connect to their common ancestor:
Thanks to Gary!