The legacy for Marion Skene was revealed in Bowie's will and testament, the New York Times reported at the weekend.
Skeene looked after Duncan Jones, known when he was born in 1971 as “Zowie Bowie”, the son of Bowie and his first wife, Angie Barnett.
The couple lived an “open marriage”, which fell apart, and Skeene took on the task of bringing up “Zowie”, who is now an award-winning movie director.
The pair had moved to Blonay, a municipality near Montreux in the canton of Vaud, where they found a chalet in 1976.
Three years later they were divorced while Bowie, in his “Thin White Duke”, phase was wrestling with drug issues while dividing his time between Switzerland and Berlin.
Skeene effectively became “Zowie”'s mother, the Daily Mail reported in 2010.
“I've always considered her as my mum,” the newspaper quoted Duncan Jones as saying, “so I never felt I was missing out in any way”.
The money left by David Bowie (whose real name was David Jones) was outlined in a 20-page will filed last Friday in a Manhattan court.
The New York Times said Bowie left an estate worth around $100 million, with half earmarked for his second wife, model Iman Abdulmajid Jones.
The paper said that 25 percent was left to Duncan Jones, with another 25 percent to Alexandria, his daughter with Iman.
In addition to the sum for nanny Skene, he left $2 million to Corinne Schwab, a former personal assistant of his in the US, where Bowie moved after living in Switzerland for around two decades.