John Diamond - Margaret McGaw - We have the family sorted
Sarah b: about 1820, William b: about 1824, Margaret born 1829, Alexander b:1830
Sarah married Richard Russell in London about 1840
William married Johanna (Thomson) Brown in Sydney 1860
Margaret married William Elliot in Sydney 1854
Alexander married Alicia O'Neill in Sydney 1852
William & Johanna went to Golden Bay etc. Others stayed in Australia
Not certain of John Diamond or Margaret McGaw's birth or marriage yet except that we know Margaret was Scottish & think Wigtown or thereabouts, John Diamond died in Barbados & their son Alexander was born in Grenada according to his death certificate.
Have Margaret's second marriage to Thomas Henry Hartley London 1836 & her second family etc.