Here's what will be airing on TBS Christmas Eve and Christmas Day, all times Eastern:

December 24th (Christmas Eve):

5am-Family Matters: "Miracle on Elm Street" (S6E11, OAD: December 16, 1994)
5:30am-Family Matters: "Fa La La La La Laagghh!" (S7E11, OAD: December 15, 1995)
6am-Family Matters: "It Came Upon a Midnight Clear" (S8E13, OAD: December 13, 1996)
6:30am-Family Matters: "Deck the Malls" (S9E11, OAD: December 19, 1997)
7am-Modern Family: "Undeck the Halls" (S1E10, OAD: December 9, 2009)
7:30am-Modern Family: "Express Christmas" (S3E10, OAD: December 7, 2011)
8am-Modern Family: "The Old Man & the Tree" (S5E10, OAD: December 11, 2013)
8:30am-Modern Family: "White Christmas" (S7E9, OAD: December 9, 2015)
9am-Modern Family: "Snow Ball" (S8E9, OAD: December 14, 2016)
9:30am-Modern Family: "Stuck in a Moment" (S10E10, OAD: December 12, 2018)
10am-Modern Family: "The Last Christmas" (S11E9, OAD: December 11, 2019)
10:30am-Friends: "The One with the Monkey" (S1E10, OAD: December 15, 1994)
11am-Friends: "The One with Phoebe's Dad" (S2E9, OAD: December 14, 1995)
11:30am-Friends: "The One Where Rachel Quits" (S3E10, OAD: December 12, 1996)
12pm-Friends: "The One with the Girl from Poughkeepsie" (S4E10, OAD: December 18, 1997)
12:30pm-Friends: "The One with the Inappropriate Sister" (S5E10, OAD: December 17, 1998)
1pm-Friends: "The One with the Routine" (S6E10, OAD: December 16, 1999)
1:30pm-Friends: "The One with All the Candy" (S7E9, OAD: December 7, 2000)
2pm-Friends: "The One with the Holiday Armadillo" (S7E10, OAD: December 14, 2000)
2:30pm-Friends: "The One with Monica's Boots" (S8E10, OAD: December 6, 2001)
3pm-Friends: "The One with Ross's Step Forward" (S8E11, OAD: December 13, 2001)
3:30pm-Friends: "The One with Christmas in Tulsa" (S9E10, OAD: December 12, 2002)
4pm-The Big Bang Theory: "The Bath Item Gift Hypothesis" (S2E11, OAD: December 15, 2008)
4:30pm-The Big Bang Theory: "The Santa Simulation" (S6E11, OAD: December 13, 2012)
5pm-The Big Bang Theory: "The Clean Room Infiltration" (S8E11, OAD: December 11, 2014)
5:30pm-The Big Bang Theory: "The Holiday Summation" (S10E12, OAD: January 5, 2017)
6pm-All Elite Wrestling: Dynamite
8pm-A Christmas Story (RD: November 18, 1983)
10pm-A Christmas Story (RD: November 18, 1983)
12am-A Christmas Story (RD: November 18, 1983)
2am-A Christmas Story (RD: November 18, 1983)
4am-A Christmas Story (RD: November 18, 1983)

December 25th (Christmas Day):

6am-A Christmas Story (RD: November 18, 1983)
8am-A Christmas Story (RD: November 18, 1983)
10am-A Christmas Story (RD: November 18, 1983)
12pm-A Christmas Story (RD: November 18, 1983)
2pm-A Christmas Story (RD: November 18, 1983)
4pm-A Christmas Story (RD: November 18, 1983)
6pm-A Christmas Story (RD: November 18, 1983)
8pm-A Christmas Story Christmas (RD: November 17, 2022)
10:15pm-Candy Cane Lane (RD: December 1, 2023)
12:45am-A Christmas Story Christmas (RD: November 17, 2022)
3am-Candy Cane Lane (RD: December 1, 2023)
5:30am-Modern Family: "Pig Moon Rising" (S8E17, OAD: March 15, 2017)