King George VI, the father of Queen Elizabeth II, was diagnosed with lung cancer. In 1951, he underwent surgery to remove part of his left lung due to the presence of cancerous tissue. He also suffered from arteriosclerosis and died on February 6, 1952.
Princess Margaret, the younger sister of Queen Elizabeth II, was a heavy smoker for most of her life. She suffered from various health issues, including multiple strokes, and underwent lung surgery in 1985 to remove a benign skin lesion. She died in 2002, but cancer was not directly cited as the cause of her death.
Princess Alice, the mother of Prince Richard, Duke of Gloucester, was diagnosed with colon cancer in 1974. She underwent successful surgery and lived to the age of 102, passing away in 2004.
Lord Snowdon, the former husband of Princess Margaret, was diagnosed with prostate cancer in his later years. He passed away in 2017 at the age of 86.
Princess Alexandra, a cousin of Queen Elizabeth II, was diagnosed with breast cancer in 2004. She underwent successful treatment and has since been an advocate for cancer awareness.