"The photos must:
be identical (black and white or colour) produced from the same untouched negative, or exposed simultaneously by a split-image or multi-lens camera."
What does untouched negative mean?
We got our pictures done but they were slightly photoshopped so know I'm not sure if we can use them or not.
Is the photographer not supposed to do that in this case because it should be 'untouched'?
It simply means if it was shot on film you can't retouch the negative. Back in the olden days people physically touched up negatives. Much like photoshoping digital pictures. Which by the way is also not allowed.
Some VOs require one photo with the info and some require on all. It will specifically say "one" if it only want's one. Notice the quote form the USA information below and how it differs from the others.
On the back of one photo in each set, write the name and date of birth of the person appearing in the photo as well as the date the photo was taken. Enclose each set of photos in separate envelopes. Write the family member's name, date of birth and relationship to you on the corresponding envelope and close the envelope with a paper clip
.