My mom and dad were married on October 1, 1954. The night before at the rehearsal dinner, the best man took a picture with an Argus C-3 camera. He forgot to advance the film and took another on top of the first exposure. My dad wants to know if there is any way to separate those two exposures. I opined that it maybe can be done with photoshop, but I don't know because I've never used it. Does anybody know of any way to separate the two images? Thanks...

Once it's scanned into a computer you could try removing one image manually, then starting over and removing the other.
I don't know of any automated process that would do it.