Reba's parents (guest stars Barry Corbin, ""Northern Exposure"" and Dorothy Lyman, ""The Bold and the Beautiful"") are celebrating their 46th wedding anniversary. They're taking a vacation and on the way they plan on stopping by Reba's to see the family. Reba's excited about her parents' visit until her mom starts making comments about what makes a good marriage. Thinking her mother is disappointed that she didn't keep her marriage together, Reba takes the comments to heart. Nevertheless, she plans a lunch to celebrate the anniversary and tells Brock that he should stop by and say hi, but not to bring Barbra Jean. Van's terrified of Cheyenne's grandparents because he's sure they disapprove of the marriage and Cheyenne's pregnancy, blaming him. Grandma assures him that she and her husband got married young as well. She gives Cheyenne a locket that her husband gave her a few years after they got married. It contained a real diamond ring, since they were too poor to have a real one when