Sorry if the the title is not very clear but it’s easier to describe with an exemple:
I have a custom post type author where the lastname of the author is the title of the post and the firstname is a custom field. I have another custom post type book witch has authors using relationship type.
The problem is that I have authors with same lastname so when editing a book, it is difficult to distinguish these authors in the metabox listing all the authors.
Is it possible with a hook or something like that to add the firstname of the auhtor in the metabox listing ?
Thank you for your help