Plot summary
Everyone goes to Christine and Matthew's parents for Thanksgiving, a trip Christine always looks forward to given her mom's proclivity for giving her a hard time about her divorce. But when they arrive, they realize something is off. Their mom (guest star Brenda Blethyn ) is acting weird and Christine's father is nowhere to be found. They initially suspect their mother killed him and hid the body, but then learn their parents have split and their mother was too embarrassed to admit it -- especially after giving Christine such a hard time about her situation. Lucy learns about Matthew's teenage years but responds positively.
Credits
Adapted from Wikipedia contributors, The New Adventures of Old Christine season 4. HTML formatting and reference markers removed.