Alexander Keast
- Born: 23 Apr 1881, Riverton, South Australia
- Marriage: Lavinia Bessie Langley on 6 Oct 1904 in Mechanics Institute, Riverton, South Australia
- Died: 10 Oct 1965, Riverton, South Australia at age 84
- Buried: Riverton Cememtery, Riverton
Alexander married Lavinia Bessie Langley, daughter of John Langley and Mary Jane Osborn, on 6 Oct 1904 in Mechanics Institute, Riverton, South Australia. (Lavinia Bessie Langley was born on 11 Aug 1885 in Wonna, South Australia, died on 18 Jun 1966 in Riverton, South Australia and was buried in Riverton Cememtery, Riverton, South Australia.)
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