Dame Ann Parker Bowles was the former mother in law of Camilla Rosemary Shand through which son? 
Ann Parker Bowles:  Through her eldest son Andrew, she was the former mother-in-law of Camilla Rosemary Shand who later became The Duchess of Cornwall. Andrew Parker Bowles: Brigadier Andrew Henry Parker Bowles OBE (born 27 December 1939) is a retired British Army officer.
i don't know