I can see in the HTML that the AvantRelationships code is there, but it looks like it is being obscured by the code for the zoomable image. You can test this theory by removing the zoomable image and also try another theme – I think one or the other is creating a conflict with the code emitted by AvantRelationships.
Note also that the page is getting a jQuery error. I don’t know if that is contributing to the problem.
You could also look at the AvantZoom plugin to see if it will work for you. You can see examples of using it here.
I am away until Monday, but can work on this with you then. In the meantime, please try the suggestions above (remove the zoom image, try another them) to see if those things are causing the detailed relationships information to be hidden.