MACARTHUR-ONSLOW, JAMES WILLIAM (1867-1946), soldier, grazier and politician, GEORGE MACLEAY (1875-1931), soldier and grazier, and FRANCIS ARTHUR (1879-1938), grazier and businessman, were born at Camden Park, Menangle, New South Wales, sons of Arthur Alexander Walton Onslow and his wife Elizabeth (1840-1911), daughter of James Macarthur and granddaughter of John Macarthur.

Arthur Onslow died in 1882 and in 1887 their mother took her surviving six children to Europe for their education. She studied dairying in southern England and the metayage share-farming system in Italy and, on returning to Australia in 1889, founded the dairying complex on the Camden estate and installed a relation A. J. Onslow Thompson as manager in 1889-1915. In the 1890s the model dairies and creameries were served by twelve co-operative farms and forty leased farms—the milk and butter were sold on the Sydney market. In 1899 Elizabeth converted the estate into a private company with her ...

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Australian Dictionary of Biography