The following John Williams may have been Mary's brother:
WILLIAMS John, Christiana SEIDEL married 1849-07-28 at St George, Gawler, aged 25, 25
WILLIAMS John, Christiana SEIDEL, parents of child born 1854-02-15 named Jane at (Ade)
WILLIAMS John, Christiana SEIDEL, parents of child born 1856-05-17 named Mary
WILLIAMS John, Christiana SEIDEL, parents of child born 1860-05-23 named David at Lyndoch Vy
Ships are being reviewed for ships carrying a John and Mary Williams as possible brother and sister. HOOGHLY from London, arrived 24 Oct 1846, is one example.
Sources
GenealogySA.org.au:Groom Given Name(s): Samuel Groom Last Name: THOMAS Bride Given Name(s): Mary Bride Last Name: WILLIAMS Marriage Date: 1853, December 03 Marriage Place: Res of John Williams Barossa Groom Age: 46 Groom Approx. Birth Year: 1807 Groom Marital Status: W Groom Father: Bride Age: 39 Bride Approx. Birth Year: 1814 Bride Marital Status: S Bride Father Name: District: Adelaide Symbol: Book/Page: 17/245
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