I told her he doesn't even have a sister.

4 seconds sound clip from the Mrs. Doubtfire movie soundboard.

You can hear this line at 01:12:46 in the Blu-ray version of the movie.

Quote context

[...]

- He knows who I am.

- Yeah.

- Did you ever wish that sometimes you could freeze-frame a single moment in your day, look at it and say, This is not my life?

- Miranda, what are you home early for, dear?

- I had an appointment.

- Oh, thank you.

- That's all right.

- With the court liaison Mrs. Sellner.

- I can't believe it.

- What, dear?

- She says that Daniel has some woman living with him pretending to be his sister!

- I told her he doesn't even have a sister.

- Oh, Mrs. Sellner's probably mistaken.

- Oh, she's a social worker, dear, really.

- And, besides, how could he replace you and so quickly, really?

- She's supposed to be older and very unattractive.

- Really?

[...]