"My sister has passed away as a direct consequence of my mum's actions and beliefs and I don't want anyone else to go through the same pain or loss that I have," said Sebastian, son of anti-vaxxer and a British conspiracy theorist Kate Shemirani, whose daughter passed away from cancer at the age of 23.Sebastian blames his mother and her beliefs to have influencing his sister into not taking proper cancer treatment. Kate, now an anti-vaccine activist and former nurse, had lost her license to practise in 2020 for misconduct and is best known for promoting conspiracy theories about COVID-19 vaccinations and 5G technology.Her daughter, Paloma Shemirani passed away last July from a type of blood cancer when she was only 23. As per her brother's claim, it is the mother who is to be blamed. However, Kate and her husband wrote to the BBC, claiming that they have evidence against the NHS for her daughter's death. The BBC reports: "'Paloma died as a result of medical interventions given without confirmed diagnosis or lawful consent'. The BBC has seen no evidence to substantiate these claims."Her brothers, Gabriel and Sebastian, allege that Paloma ultimately declined conventional chemotherapy—despite doctors giving her an 80% chance of survival—due to pressure from their mother, with whom she was trying to rebuild a strained relationship.They further claim their mother deliberately isolated Paloma from her friends, boyfriend, and extended family, even as her cancer visibly worsened. Paloma, a Cambridge graduate who once celebrated top exam results with a bright smile, had dreamed of a career in publishing.But her life, her brothers say, was tragically cut short under the undue influence of their mother, who gained notoriety during the pandemic.What Happened To Paloma?In 2023, when Paloma was diagnosed with cancer, doctors informed her she had an 80% chance of recovery if she underwent chemotherapy. But her mother, as reported by the Daily Mail, strongly opposed the treatment.In a message sent in all capital letters to Paloma’s boyfriend, she warned: “TELL PALOMA NOT TO SIGN IR (sic) VERBALLY CONSENT TO CHEMO OR ANY TREATMENT.”Despite medical advice and growing concerns about her mother’s influence, Paloma declined chemotherapy. Instead, she turned to one of Kate’s former partners, who encouraged her to consider Gerson therapy — a debunked alternative treatment that promotes a strict plant-based diet and coffee enemas as a cure for cancer, which Kate, too, has claimed, helped in curing her breast cancer.Cancer Research UK states there is “no scientific evidence” supporting Gerson therapy as an effective cancer treatment. The charity notes that while some people turn to it in search of control over their illness, no credible clinical studies support its use, and existing research is often biased or funded by pro-alternative medicine groups.Kate’s former partner told the BBC that “any assertions that I played a role in her death are legally inaccurate.”As Paloma pursued this alternative path, friends began to notice her condition deteriorating, as reported in the Daily Mail. New lumps were appearing, and her cancer was visibly spreading. She reportedly distanced herself from anyone who questioned her treatment decisions.Her school friend Chantelle shared, “I don’t think her ideology was strong enough to make those decisions. People have different opinions, but I believe her mum played a massive, massive role in it.”Gabriel, one of Paloma’s brothers, attempted to visit her but was told she couldn’t go outside due to “bad air.” He initiated legal proceedings to have her properly medically evaluated, but the case never moved forward. Paloma died in July 2024 after suffering a heart attack caused by her tumour. She was taken off life support after several days in the hospital.Gabriel only learned of her death days later through his lawyer and had to inform their brother, Sebastian.An inquest into Paloma’s death is scheduled to begin next month.Who Is Kate?Now 60, she calls herself a 'natural nurse', even though she has been banned from practising nursing in the UK. She also made headlines during the pandemic when she used her social media account to claim that COVID-19 vaccines had a 'tiny bit of Satan' inside, and claims like the jabs caused cancer and contained material harvested from aborted fetuses.She also claimed that the COVID-19 virus was connected to the rollout of 5G technology and described it as a political tool designed to alter people’s DNA. She compared lockdowns to the Holocaust, declared that NHS nurses seen dancing would one day “stand trial for genocide,” and labelled vaccination teams as “death squads.”As of now, she has not commented on her sons' claims.Cancer, Cause And Cure, And Unscientific ClaimsSebastian has previously described his childhood as “hell,” claiming he was subjected to years of brainwashing. He recalled being terrified at age 10 when Shemirani told him that "the Rothschilds plan to live on a space station" and that a mass genocide was imminent.In 2012, Kate was diagnosed with breast cancer and underwent surgery, including a double mastectomy and reconstruction. However, online she attributed her recovery not to medical treatment, but to ‘Gerson therapy’—a debunked alternative approach promoting a strict plant-based diet, alongside vitamin and mistletoe injections."I'm still here and thriving. You can shove your poison mustard gas where the sun doesn't shine, you pimps and assassins," she posted on X earlier this year, referring to chemotherapy.According to Chantelle, as reported by Daily Mail, a school friend of Paloma’s, Kate’s belief that conventional medicine had failed only deepened after her recovery. She recounted watching Paloma get sunburned because she refused to wear sunscreen, believing it—not sun exposure—caused cancer.While Gabriel and Sebastian are now estranged from their mother, Paloma maintained contact, seemingly in an effort to repair their relationship. Like her mother, she also declined the COVID-19 vaccine.