Find Other Photos - Causing Issue For Customers

Hello! 

EDIT: I eventually found another thread where they were having the same/similar issue. Advice was to put the "other" photos (in my case sibling photos) into a sub gallery within the same gallery. I'll add a feature request to have that "Find Other Photos" search the whole  site rather than just the one gallery. 

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We have sibling photos for certain jobs separated out into another gallery. This is so that we are able to allow one account to download all of the individual child photos in a gallery, but not the sibling photos. 

We simply provide one passcode for each child's individual photo, and another passcode for their sibling photo. It all works fine if you enter any one of the passwords into the Find My Photos page. 

However, if the customer enters one password (be that and individual one or the sibling one) they can download that photo, but when they click on "Find Other Photos" button to enter the next password, it will ONLY then search within that gallery. If they are already in the individual child gallery, it will give them a "Photos Not Found" error when they try to search the sibling photo, or vice verse. 

Is there some way to either disable the "Find More Photos" button, or redirect it back to the Find My Photos page which will search the whole site, not just that one gallery? 

Or another possible work around for this issue, so we're able to keep all the photos in one gallery, but not allow the sibling photos to be included with the individual child photos when the "gallery owner" downloads their low res watermarked copies?