Dr. Frederick Muench and his brother-in-law, Gregory Nemec, are the authors of a new book that gives parents an opportunity to see humor in what can sometimes be an overwhelming job. While �The Official Guide to Dysfunctional Parenting� (Andrews McMeel Publishing, 2008, $9.99) is meant to make readers laugh, it has a serious side, too, they say. Muench is a clinical psychologist and director of clinical research and development at Helicor Inc., a stress-management company. Nemec is a teacher and freelance illustrator. Both are New York residents and married fathers of two children. ...