Passcode Photos In A Password Protected Page

I have a password protected wedding page for a client, they are the gallery owner. They want to have some photos excluded from the gallery for guests, but viewable to specific family members.  They can hide the photos, but that hides them from all.  Can I passcode these photos even though they are already uploaded so that they can share the gallery password with everyone, and then the passcode photos on the ones they want shared with specific people and not others?  I have been trying to achieve this but failing miserably.

I don't think that will work. You will just have to make them a separate gallery.