E S Pearson Family Correspondence Correspondence between E S Pearson and his immediate family, primarily letters to and from his mother, Maria Sharpe Pearson (MSP), but also with his sisters, Helga Sharpe Pearson (later Hacker), Sigrid Loetitia Sharpe Pearson (later Bousfield) and his father, Karl Pearson (KP). Also includes a small number of letters to and from his grandfather William Pearson, his aunts Julia Sharpe, Loetitia Sharpe and Mary Catherine Sharpe, and some cousins and family friends. Early 20th Century