It's Christmas time at TGS and everybody is celebrating. Liz is happy that her parents along with her brother are taking a trip to New York to see her. Jack is relieved that his mother can't make the trip to see him. But, his happiness is short-lived when she shows up.
Tracy missed his court date because he had to stop for breakfast. For punishment, the judge gave him an ankle monitor to wear for 30 days. That meant no alcohol for Tracy at the TGS holiday party, "Ludachristmas". Liz bans Tracy from "Ludachristmas" to keep him from slipping.
Liz gets super-excited to see her family at work. Her brother, Mitch suffered a ski accident in 1985 and now has a disorder where he can't remember anything after the accident. Jenna reminded the staff that even though Mitch is stuck in 1985 he has matured very much sexually, a fact Liz would like Jenna to stop talking about.
Jack is surprised with how normal and close Liz's family is. Later on, Jack tries to get into his own holiday spirit by inviting his highly judgmental mother to stay with him for Christmas.
Liz's parents invite Jack to go ice-skating with them and he's excited to get away from his own negative mother. Liz is trying to get Jack to admit he wished he was a 'Lemon'. Jack's mother shows up and gets an invitation to the Lemon family dinner and she accepts.
Kenneth is getting more and more offended with how the staff is treating the meaning of Christmas. He brings in a reverend in hopes that the staff will learn the real meaning of Christmas. Tracy goes crazy and later admits he was drinking before the party.
Jack's mother wants to make a point that the Lemons are just as screwed up as any other family. At the family dinner, chaos breaks loose when Liz lets it slip that that Mitch is really 40! The Lemons begin loudly fighting and Jack's mom feels satisfied in proving her point to Jack.
The TGS staff holds their party with Jenna serenading the crowd with Christmas carols. Meanwhile, Jack feels closer to his mother and the two bond over watching the Lemons continuing their fighting at the dinner table.