South Australian Morphett families include the children of Nathaniel Morphett and Mary Morphett (née Gliddon):
Other Morphett families figure prominently in the early history of the towns Clarendon, Truro and Quorn, but their relationship to the two politicians is yet to be established.
Sir John Morphett was a South Australian pioneer, landowner and politician. His younger brother George Morphett was also an early settler in South Australia.
Robert Cock was one of the first European explorers of the Adelaide region of South Australia following the establishment of the colony in December 1836.
Edward John Peake was a winemaker, auctioneer, land agent, magistrate Member of Parliament and a prominent member of the Catholic Church in the early days of South Australia. born in Gloucestershire.
John Brodie Spence was a prominent Scottish-born banker and politician in the early days of South Australia. He was a brother of the reformer Catherine Helen Spence.
William Rounsevell was a businessman of Cornish origins who founded a livery stable and mail coach business in the early years of colonial South Australia. His sons John Rounsevell (c.1836–1902) and Ben Rounsevell (1842–1923) were prominent businessmen, pastoralists and politicians in South Australia.
Cawthorne and Co, also known as Cawthorne's Limited, was a company founded in 1870 in Adelaide, South Australia, by Charles Cawthorne and his father William Anderson Cawthorne, which dealt in musical instruments, sheet music and recordings, and acted as concert promoters.
Jacob Pitman was an architect, builder and educator in the colonies of South Australia and New South Wales. He was a brother of Isaac Pitman and was associated with his development of shorthand transcription.
George Morphett was a settler in the colony of South Australia, and younger brother of John Morphett.
Thomas Young was a politician in the early days of the colony of South Australia. His eldest son, also named Thomas Young, was for many years mayor of Port Augusta.
Alexander Anderson was a politician and hotelier in the young colony of South Australia.
John Hallett was a businessman, pastoralist and politician in the early days of the Colony of South Australia who was implicated in the massacre of Aborigines at Mount Bryan, South Australia in the 1840s.
William Mair was a politician in the British colony of South Australia.
Charles Hegan Myles was a politician in the British colony of South Australia.
George Mayo was a medical practitioner in the colony of South Australia.
Richard Bowen Colley was the first mayor of Glenelg, South Australia.
John Henry Richman was a lawyer in the young British colony of South Australia.
The District Council of Kanyaka was a local government area in South Australia that existed from 1888 to 1969.
John Acraman was a prominent businessman in the colony of South Australia, and has a place in the history of Australian football in that State.
Richard Francis Newland was a banker and politician in the colony of South Australia, appointed as an acting non-official member of the Legislative Council of South Australia, serving from January 1847 to July 1847.
Mellor Brothers was a farm machinery manufacturer in the early days of the colony of South Australia, founded by Joseph Mellor, and carried on by two of their four sons.