Anne Caroline Salisbury is the maternal great-grandmother of which wife of King George VI and the mother of Queen Elizabeth II and Princess Margaret, Countess of Snowdon?
Anne Caroline Salisbury:  She is the maternal great-grandmother of Queen Elizabeth The Queen Mother and great-great-grandmother of Queen Elizabeth II. Queen Elizabeth The Queen Mother: Elizabeth Angela Marguerite Bowes-Lyon (4 August 1900 – 30 March 2002) was the wife of King George VI and the mother of Queen Elizabeth II and Princess Margaret, Countess of Snowdon.
Queen Elizabeth The Queen Mother