You two have spent this entire vacation at each other's throats.
4 seconds sound clip from the Meet Me in St. Louis (1944) movie soundboard.
You can hear this line at 01:20:48.594 in the DVD version of the movie.
Quote context
[...]
- Look who's talking. You're sulking just because Warren Sheffield didn't ask you to the dance.
- Rose turned down literally scads of dates. She could have had any man she wanted.
- Hah! This is what I call real Christmas spirit!
- You two have spent this entire vacation at each other's throats.
- Alonzo Smith, did it ever occur to you that you might take your sister to the dance?
- Is there anything wrong with you going with your own brother?
- And be the laughingstock of St. Louis?
[...]