Andros Georgiou has sensationally claimed the star mixed methadone, booze and GHB in the days before his death in an attempt to calm his anxiety.
Superstar George, 53, who died over Christmas 2016, was so desperate for more methadone he got a taxi driver to deliver it to his home in Goring, Oxon, disguised as a present, his cousin claims.
Andros also hit out at George's partner Fadi Fawaz, 44, who is living at the Careless Whisper singer's £5million Regent’s Park home. He told The Sun: "George’s family want to ensure Fadi stays quiet and feel they may have to agree a deal.  
“I have heard he is demanding a house and a retainer. “They can’t divide the assets until they know if they are giving Fadi money, and how much.”
He added: “I think when they do sort it out there will be a lot less than the £105million that is often mentioned, maybe £50million less.
“George was not that interested in money and spent a lot in his final years.”
It comes as the star's family have requested fans remove tribute from outside the late singer's former homes - for the sake of his neighbours.
Since George's death in 2016, followers have flocked to his homes in Highgate London and Goring-on-Thames, Oxfordshire to pay their respects.
Flowers, messages, candles and another items now line the properties as an ongoing tribute to George.
But the star's sisters Mel and Yioda, his father Jack and friend David Austin have released a message on the music star's official website asking fans not to add any more.  
The statement read: "[We have been] touched by your many tributes celebrating and remembering Yog, reminding us how very much he is missed and loved.

"However, we feel we cannot expect our Highgate and Goring neighbours to continue to accept as normality, the memorials so personal to you all, to remain as and where they are any longer, although we do appreciate your recent efforts to minimise their impact."

They asked those who paid their respects remove their tributes by the weekend of May 26/27, so both properties can be returned "to their former simple state". 
Calling him by his nickname. they continued: "Yog liked his privacy, his homes were true havens for him (such a Cancerian!) and, ultimately, long term, we know he would not want to disturb or change the quiet neighbourhoods he so loved, for the people in the local area, who honestly, despite reports otherwise, have been gracious and very understanding."

Michael's relatives and friend asked that his fans, referred to as "lovelies", instead make a donation or volunteer at a charity, adding that it would be a "fitting tribute".