The former F1 legend has not been seen in public since the accident.
The family statement said: “You can be sure that he is in the very best of hands and that we are doing everything humanely possible to him.
“Please understand if we are following Michael’s wishes and jeeping such a sensitive subject as health as it has always been, in privacy.
“At the same time we say thank you very much for your friendship and wish you a health and happy year 2019.”
The family is releasing the an app on his 50th birthday which will be a “virtual museum” of the driver’s achievements.
The statement added: “As a gift to him, you and us, Keep Fighting Foundation has created a virtual museum. The Official Michael Schumacher App will be released tomorrow, so that we can review all together Michael’s successes.
“The app is another millstone in our effort to do justice to him and you, his fans, by celebrating his accomplishments. We with you a lot of fun with it.”
The former Ferrari driver is being treated at his home in Switzerland, but little is known about his recovery.
Schumacher suffered life-changing injuries when he hit his head on a rock while skiing with his family.
He spent six months in a medically induced coma and continued his recovery at his home in Geneva, Switzerland.
The family have chosen to keep details about his health and recovery private from the public, in a move which is supported by F1 chief Ross Brawn who said the family are right to conceal his medical condition.
The wall of secrecy has been enforced by Schumacher’s wife Corinna to protect one of the biggest names in modern sporting times.
However his former manager Willi Weber said more should be known about the champion as he was in the public light for many years and commanded a following of millions around the world.
He said: “I find it very unfortunate that Michael’s fans do not know about his health. Why are they not being told the truth.”
But Brawn agrees with Corinna and has visited the former champion in Switzerland.
“I am constantly in touch with Corinna, and I totally agree with their decision,” he said.
“Michael has always been a private person and that’s been a guiding principle in his career, his life and his family always agreed with that choice.
“It’s completely understandable that Corinna has wanted to maintain the same approach, even after the tragic event, and it’s a decision we must all respect. I’m sure the millions of people who are still Michael fans will understand it too.”