Zara Tindall and Peter Phillips have 'secretive younger sister' who lived on same huge estate
Princess Anne's children, Peter Phillips and Zara Tindall have a lesser-known younger sister who prefers to stay out of the spotlight. Stephanie Phillips, the daughter of Princess Anne's ex-husband Captain Mark Phillips and his second wife Sandy Pflueger, grew up close to her half-siblings on the sprawling Gatcombe Park estate.