On tonight's Christmas-themed 30 Rock, Elaine Stritch reprised her role as Jack's evil mother, Colleen, delivering one hilariously tense family moment after another. What happened? when Jack revealed to Colleen that he knew about his real father? Find out inside.

Here's a video compilation featuring each scene related to the Donaghy Christmas family ambush, presented in the order in which it aired:

[30 Rock]