In response to Betamikes posting above, let me fill in a few more details, because the "hillbilly" family DOES have a SDC connection:
According to Leon Fredrick, in his book "Ozarks Hillbilly Editor," Fredrick ran a newspaper in Stone County, Missouri and prior to SDC opening, Fredrick approached the Herschends about putting in an old time print shop. They agreed, and Fredrick ran the shop...it essentially was his shop...and it made more money than the newspaper he owned. His first employee at the print shop was a fellow by the name of Bruce Seaton. Bruce grew a long beard, and developed stories to tell the tourists...before long, he became a "professional hillbilly." In addition to working at the SDC print shop, Seaton began playing "Preachin' Bill" at Shepherd of the Hills. Bruce and his wife developed the postcards and calenders you have seen since the 1960s. Bruce and his family became "well off" and the kids pictured in the photos were his. Quoting Leon Fredrick here, "Bruce died young from excesses brought on by worries with his money and fame." Bruces' wife Dorthy later remarried. In the 100 year anniversary edition (2007) of the Shepherd of the Hills booklet she is honored with a profile...her name is Dorthy Kniffer, and has been with Shep. Hills since 1967. Dorothy's children are Steven, Paul, Ruth, Mark, Martha, and Kenny. She has many grandchildren.
I've got many of the Hillbilly postcards in my files/collection, too. There are many of them. They are all funny.