Sebastian Shemirani is estranged from his anti-vaxx protest leader Kate Shemirani. His mother has claimed in the past that vaccines are poisonous and believes they contain military-style tracking technology.
Despite more than 30 years as a registered nurse, Ms Shemirani believes the pandemic is nothing more than a “scamdemic”.
She sparked fury after she likened lockdown restrictions to Nazi atrocities.
But now her estranged son took to Twitter to slam his mother after a school friend died after contracting the virus.
He wrote: “Today I learned that a childhood friend of mine, WHO MY MUM USED TO DRIVE TO SCHOOL with me, has died of Covid complications while working as a junior doctor.
“She was one of the smartest and loveliest girls I ever knew.
“And my mum was campaigning to put her at risk. So angry.”
Sebastian has previously spoken out about his mother’s comments and said she should be “prosecuted”.
He said at the time: “I wouldn’t say that most people who believe these ideas are beyond [help].
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Police have launched a probe against her after she claimed doctors and nurses are like Nazi doctors and should face “Nuremberg trials”.
She then said: “At the Nuremberg Trials, the doctors and nurses stood trial and they hung.
“If you are a doctor or a nurse, now is the time to get off that bus.
“Get off it and stand with us, the people, all around the world they are rising.”
She shockingly claimed vaccination teams should be renamed “death squads” and that the NHS should be referred to as the “new Auschwitz”.
The Met said in a statement given to Sky News in July: “We are aware of video circulating online showing a speech that occurred during a rally in Trafalgar Square.
“Officers are carrying out inquiries to establish whether any offences have been committed.
“No arrests have been made.”
Mayor of London Sadiq Khan also tweeted: “This is utterly appalling, and I have raised it directly with the Met Police.
“Our NHS staff are the heroes of this pandemic and Londoners from across this city roundly reject this hate.”