These are all linked from Ancient Faces. To see the original entry go to ancientfaces.com and search the names.
Williams family; ma and pa Williams with their (probably) five children, two sons-in-law, and grandchildren. Atkins & Smith are also represented--probably the sons-in-law.
James and Mary Leonard family; names are listed on the photo itself.
Contributor's grandmother said that this was her family from Indiana. It is probably the Sheets family but could be Jordan. First names may be: Salathiel, Albert, Caroline.
James Allen is the young man at the back second from right with the X above his head, with his parents and siblings. The other members of the family are not named.