Buy it! The special features are terrific, especially interviews with cast members and the QUIZ!
FYI, another great film made from a Shepherd story featuring the family is Ollie Hopnoodle's Haven of Bliss!
Have also heard there was a sequel called It Runs in the Family (aka My Summer Story) though many people on IMDB.com
weren't too fond of it. Woman who played Ralphie's teacher is in this one, too, but otherwise...
http://imdb.com/title/tt0110168/