In Google Photos, you have the option to share photos with a partner. The partner also has the option to store all photos in their camera roll. This is exactly what happened, and I'd like to delete my photos in my partner's camera roll.
I've looked into the Google Photos API and I've looked at the recently added page in Google Photos (https://photos.google.com/search/_tra_), but neither offer the information that is shown in the browser when I view a photo from my library in my partner's camera roll. See image below:

Is there an easy way to "undo" adding all photos from a partner's library? Or is there an option to find these photos? According to the screenshot, Google does have the info somewhere...
Hope that someone could help me out, I'll update the post if I find something.