And you, her own sister, how could you do such a thing?
6 seconds sound clip from the White Christmas (1954) movie soundboard.
You can hear this line at 01:34:20 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, no. You're not gonna start again with that life-saving bit.
- Well, I told you, I don't expect any gratitude.
- I'm not even sure you saved my life. Sometimes I wish the wall had fallen on me.
- And you, her own sister, how could you do such a thing?
- It's always that she's been a kind of a mother hen...
- Yeah, we wanted the mother hen to leave the roost, so that the little chick could...
- Well, I guess we laid an egg.
- An egg? Brother, you laid a Vermont volleyball!
- I'm going to New York and try and square it with Betty.
[...]