SPOT THE ERROR (1)

Hello everyone. Welcome back! I hope that you enjoyed your weekend. 

This week we are bringing back the Spot-the-Error theme. Do you know what is wrong with the sentence below?

Sentence: Don't forget that we are taking my brother to the party, so we have to pick up him at 9:00. 

If you know what's wrong with this sentence, please tell us on one of our social media sites (Facebook or Twitter) and we will post the correct answer later; we will also include it in tomorrow's Daily Vitamin email.

Facebook: https://www.facebook.com/ZigguratEscuelaCorporativadeIdiomas

Twitter: https://twitter.com/ZigguratIdiomas

We are excited to see your answers! Good luck and have fun!