Relationship between two custom post types

Hi!
I have two custom post types, “collections” and “products”. Each product belongs into a collection. I have a taxonomy for collections, where each product gets assigned which collection it is in and lets me display them along with all other products in that collection via a taxonomy.php file.

On my taxonomy.php page I now need to figure out a way to get the correct(parent) collection’s information, such as a blurb about that collection, header image, etc. How do I best do this in a dynamic way? How can I set up a relationship where the taxonomy page gets what parent collection is the current one?

Thank you in advance for any guidance in this!