But why are you so interested?- I'm not. It's just that he's your brother and...
6 seconds sound clip from the The Oklahoma Kid (1939) movie soundboard.
You can hear this line at 00:42:35 in the DVD version of the movie.
Quote context
[...]
- Ned, why didn't you tell me about him?
- It's just that dad and I don't think of him as a member of the family anymore.
- He wasn't as a kid. We were great pals then. But as he grew up, everything changed.
- He got so he thought the law was meant for one thing... Just to be broken...
- So finally dad had to throw him out.
- But why are you so interested?- I'm not. It's just that he's your brother and...
- Jane, you know how I feel about you.
- I would have spoken sooner, but I wanted to get myself established first.
- Ned, let's not talk about it now. Come back later, tonight.
[...]