Arthur Macarthur-Onslow Australian grazier and investor (1879-1938) (1879–1938) Parents Elizabeth Macarthur-Onslow Arthur Alexander Walton Onslow Children Margaret Elizabeth Macarthur-Onslow Andrew William Macarthur-Onslow Edward Macarthur-Onslow Denzil Macarthur-Onslow Siblings James Macarthur-Onslow Arthur William Macarthur-Onslow Arthur John Macarthur-Onslow George Macarthur-Onslow Emily Susan Macarthur-Onslow Rosa Sibella Macarthur Onslow Partners Sylvia Raymond Chisholm