Margaret was born on March 19th, 1734 in Dunfermline and her baptism took place there on March 28th, 1734.1 Margaret's father was James Thomson and her mother was Margaret Mudie. She had three brothers and two sisters, named Robert, John, James, Charlot and Janet. She was the oldest of the six children. She died at the age of 34 on January 30th, 1769 in Dunfermline.2