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Schwarzenegger and Shriver's son doing better after injury

Patrick Schwarzenegger points to the image of his younger brother, Christopher, who was badly injured while boogie boarding. The older brother tweeted Sunday, July 24, 2011 that his brother was doing a lot better and posted this photo to whosay.com. (Patrick Schwarzenegger / whosay.com)

July 24, 2011 12:00:00 AM PDT
The youngest son of Arnold Schwarzenegger and Maria Shriver is doing better after a serious boogie boarding accident in Malibu last Sunday.

The older brother of 13-year-old Christopher Schwarzenegger tweeted, " My brother is doing alot better. Wearing this shirt for him ."

In the tweet, Patrick Schwarzenegger smiled and pointed to the shirt with his younger brother's face on it.

Christopher Schwarzenegger suffered a collapsed lung and broken bones in the accident.

He is recovering at the hospital. His family says he's expected to make a full recovery.