sentences:  The family eventually placed a stone memorializing Robert, his brother John Montresor Haswell, and sister Susanna Rowson, in the Forest Hills Cemetery in Boston's Jamaica Plain neighborhood.Haswell is best known for the logs that he kept of his voyages to the northwest.These provide a detailed record of contacts with various native peoples and other European traders, and prove an invaluable source for the history and anthropology of the region.