Los Angeles ( CNN ) -- Christopher Schwarzenegger , the 13-year-old son of former California Gov . Arnold Schwarzenegger and Maria Shriver , was hospitalized after a serious surfing accident in Malibu , California , over the weekend , a source close to the family said . His parents confirmed the accident in a joint statement issued Friday . `` While it has been a very scary week , Christopher is surrounded by his family and friends , '' they said . `` He is a brave boy and is expected to make a full recovery . '' Schwarzenegger slammed face-on into an object on a beach and was seriously injured , said the source , who asked not to be identified because of the sensitivity of the matter . He was initially treated in an intensive care unit but was later moved to another unit in the unidentified hospital , the source said . `` 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 , '' the family statement said . Patrick , his 17-year-old brother , posted a Twitter message Friday morning indicating that Christopher is doing well in the hospital . `` Thank you everyone for your messages about my brother . This kid is strongest kid I ever seen . Keep praying , '' he said . Christopher is the youngest child of the former couple . Shriver filed for divorce from Schwarzenegger on July 1 after the revelation that he fathered a child with their housekeeper . The child was born less than a week after Christopher , according to birth records .
NEW : ` ` It has been a very scary week , '' his parents say . TO : ` ` He is a brave man and is going to make a full recovery , '' family says . Christopher Blake , 18 , runs into an object on a Malibu beach , a source says . His parents are divorcing after the revelation that his father has an out - of - control son .