The photos appear to be on a metallic medium, and are covered with a thin glass (resulting in the blurring of the picture above on my scanner). The whitish marks on the scan above are from fingerprints on the glass, not in the pictures.
The outside of the casing shows a relief of a mother kissing a small child with a large dog (?) watching. This is on both halves of the casing. There is no other identifying feature on the casing - inside or outside.
I am not sure who these people are, but I'm guessing that it was handed down to Gerry from her mother. Depending on the year the photos were taken, I have several candidates for who they are, assuming they are from Gerry's and my father's ancestry.
Can anyone give me an estimate of the year these photos were taken, based on the photo type, the case type, the clothing, the poses, the hair styles, etc.?
UPDATE 1 June, 1:15 PM: In comments, Dana and Jimmy have suggested that these are Civil War era photographs. Joy provided these very helpful links for photo dating:
"http://www.costumes.org/history/100pages/photodating.htm and http://www.cyndislist.com/photos.htm#Dating have a lot of links to information about dating historical photographs."
Thank you all! I will report further when I have a better idea for the time frame.