Celebrity Fergie's Dad in Cancer Fight By People Staff Published on June 2, 1999 12:00 AM Share Tweet Pin Email The 67-year-old father of the Duchess of York, Maj. Ronald Ferguson, has been waging a secret war against cancer for nearly two years, it has been revealed. Maj. Ferguson is now in remission, according to reports. He was diagnosed with the disease after a regular medical check-up and underwent radiation treatment between February and April 1997. His daughter Sarah is reported to have been a tower of strength to her father throughout his ordeal. The revelation comes just two months after the death of the Duchess’s mother, Susan Barrantes, in a car crash in Argentina. On Thursday the family said that a memorial service for Barrantes will be held next Tuesday at St. Paul’s Church in London.