...Family Tree - The Cooper Extraction: Sheldon goes back to Texas when his sister goes into labour. While he's away, the gang meet at the flat to decorate the Christmas tree. (S7 Ep11/24) [AD,S]
...Family Tree - The Thanksgiving Decoupling: Howard's grumpy father-in-law bonds with Sheldon over some anecdotes about his family during Thanksgiving at Mrs Wolowitz's house. (S7 Ep9/24) [AD,S]
...Family Tree - The Santa Simulation: Sheldon unwillingly reveals some painful family memories of Christmas past when Leonard persuades him to join in with a seasonal game. (S6 Ep11/24) [AD,S]
...Family Tree - The Rhinitis Revelation: Sheldon's mother Mary comes to town on a trip and soon becomes a firm favourite with his group of friends, much to Sheldon's annoyance. (S5 Ep6/24) [AD,S]
...Family Tree - The Panty Pinata Polarization: Sheldon bans Penny from the flat for minor misdeeds, so she retaliates by contacting his mother. Howard and Raj are on a mission. (S2 Ep7/23) [AD,S]
...Family Tree - The Shiksa Indeterminacy: Ten episodes about Sheldon's family relationships make up this special stack. Leonard, Raj and Howard meet Sheldon's twin sister. (S1 Ep15/17) [AD,S]