Schumacher, who retired from racing in 2012, has not been seen in public since he suffered severe head injuries in a skiing accident five years ago. The German is being cared for at home in Switzerland.
"You can be sure that he is in the very best of hands and that we are doing everything humanly possible to help him," the family said in a statement that made a rare comment about his condition.
"Please understand if we are following Michael's wishes and keeping such a sensitive subject as health, as it has always been, in privacy," it added.
