A 17-year-old has been charged after a former trainee Royal Marine and his father were stabbed in south London.
Matthew Stevenson-Webber, 24, was stabbed in the back in Mitcham on Tuesday night.
His father Craig Joseph-Webber, 45, was stabbed in the head and is in a critical but stable condition.
The youth, from Birmingham, is to appear in court on Thursday charged with causing grievous bodily harm and possessing an offensive weapon.
A third man, aged 30, was stabbed in the shoulder and is also stable in hospital.
Four other teenagers questioned over the attack have been bailed.
Mr Stevenson-Webber joined the marines in 2007, but he left due to a training injury.