Thanks John. This looks like it can help with sorting the results for each post type, but can this also help with combining the posts from each post type into a single listing?
Basically the real use case is that I have two post types: Bio and Resume. The Relationship field needs to show both post types combined into a single listing, not separated by post type.
Maybe it would be best to duplicate the Relationship field and just create a new field based on it.