Patrick Schwarzenegger Hospitalized After Ski Accident

Maria Shriver Was 'Shaken Horribly' by Son's Accident: Source

After a week’s stay in the hospital for internal injuries suffered during a boogie boarding accident, 13-year-old Christopher Schwarzenegger is improving and is expected to be released by mid-week, a family source tells PEOPLE.

Maria Shriver has kept vigil at her youngest son’s bedside since he was admitted to an L.A. hospital with a collapsed lung, broken bones and broken ribs on July 17.

Christopher Schwarzenegger 'Expected to Make a Full Recovery,' Say Parents

To all the upheaval in their lives, Maria Shriver and Arnold Schwarzenegger can now add what they call this “very scary week.”

“A few days ago our son Christopher suffered an accident at the beach,” the estranged couple say in a statement after the 13-year-old boy was hospitalized in serious condition.