- You were trying to shield your mother, weren't you?
- No.
- Your father then?
- Yes. My father.

10 seconds sound clip from the The Thin Man (1936) classic radio play.

You can hear this line at 00:18:07 in the radio play.

Quote context

[...]

- Where did you get this gun?

- I bought it in a pawnshop.

- I thought so.

- Why did you say you did it? Whom were you trying to shield?

- Oh, please don't ask me.

- You've got to tell me.

- Nick, let me handle this, will you?

- Dorothy, look at me? Nick is trying to help you. Why don't you help him?

- You were trying to shield your mother, weren't you?

- No.

- Your father then?

- Yes. My father.

- Why do you think he did it?

- Mother was the first one to find Julia Wolf. She found something in Julia's hand and she took it.

- What was it?

- A watch chain. It belonged to my father.

- So you think your father did it.

- I don't know, I don't know.

[...]