Seven-time world champion Michael, 49, has been bedridden since a horrific skiing accident on 29 December 2013.
He suffered a traumatic brain injury after hitting his head on a rock while skiing in the exclusive French Alps resort of Mirabel.
His son Mick, 19, is "compeltely closed" about his dad's health, according to close pal Nicklas Nielsen.
Mr Nielsen told Danish newspaper BT: "Mick does not say he is sad about his father. He just said sometimes that it is sometimes hard.
"I know him very well, also privately. He is a very quiet and calm guy. Very nice and welcoming and he talks to everyone.
"It was completely closed and not talked about. I still do a little karting with Ralf Schumacher and his team and nobody talks about it.'
The sporting icon reportedly received £115k-a-week care at a special medical facility at his Lake Geneva home, costs which are now expected to have exceeded £20m.
In 2016, his lawyer told a court Schumacher 'cannot walk' in response to speculation in German media about his condition.
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