- Wait a minute. Wait a minute. You have a brother named Martin McFly?
- Had a brother.

5 seconds sound clip from the Back to the Future Part III movie soundboard.

You can hear this line at 01:02:38.680 in the DVD version of the movie.

Quote context

[...]

- You had him, Mr. Eastwood. You could have just walked away, and nobody would have thought the less of you for it.

- All it would have been was words, hot air from a buffoon.

- Instead, you let him rile you. Rile you into playing his game, his way, by his rules.

- Seamus, relax. I know what I'm doing.

- He reminds me of poor Martin.

- Aye.

- Who?

- Me brother.

- Wait a minute. Wait a minute. You have a brother named Martin McFly?

- Had a brother.

- Martin used to let men provoke him into fighting. He was concerned that people would think him a coward if he refused.

- That's how he got a Bowie knife shoved through his belly in a saloon in Virginia City.

- Never considered the future, poor Martin. God rest his soul.

- Sure, and I hope you're considering the future, Mr. Eastwood.

[...]