Displaying related (custom) post types

Is there a way to display related custom post types on a page?
For instance, I'm building a library with the political "Parties" and respective "Members", both custom content types. One a given page I have a list of all parties, if I click on one I go to its (single) page and get to see its image/logo, information etc. as expected. What I want is to also display a list of all members under that political party.
Same if I go to a member's page, I get to see which party they're under, linked to its respective page, above mentioned.
Is it possible?
Hope it makes sense. Let me know otherwise.
Thanks, San