Christopher Schwarzenegger in ICU After Surfing Accident

Arnold Schwarzenegger and Maria Shriver's 13-year-old son Christopher is hospitalized in serious condition after a recent surfing accident in Malibu.  A source close to the family tells ET that Christopher was boogie boarding last Sunday when something went wrong and he suffered a collapsed lung, broken bones and broken ribs. His mother was with him on the beach after the accident. He remains in ICU at a Los Angeles area hospital. In an update on the situation on Friday, Arnold and Maria provided ET this statement: "A few days ago our son Christopher suffered an accident at the beach. While it has been a very scary week, Christopher is surrounded by his family and friends. He is a brave boy and is expected to make a full recovery. On behalf of our entire family, we want to sincerely thank the paramedics and lifeguards who responded so swiftly as well as the doctors, nurses, emergency room and hospital staff who have cared for our son. They have been extraordinary to him and to us. We thank everyone for their thoughts and prayers and ask for respect and privacy for Christopher and our family." The source said earlier that Arnold and Maria had been "very amicable" together at the hospital while visiting their son and revealed that the two had been talking regularly even before the incident. Christopher's brother Patrick took to Twitter to comment on the situation: "Thank you everyone for your messages about my brother. This kid is strongest kid I ever seen. Keep praying." His sister Katherine also tweeted her thoughts: "Thank you guys for ur concern and prayers for my baby brother! He's a tough little guy and getting better! Please keep praying for him! Xo"