Rosina Fergsuon was a Scot, born Rosina Forsyth in Dumfriesshire in 1812. She was brought up a Presbyterian and her piety is evident in her letter of 12 July 1836, as is her love for her extended family and her anxiety at leaving them to emigrate to South Australia.
Rosina married William Ferguson, a farmer of Roxburgh, Scotland, on 22 December 1835. At the time of their departure for South Australia on the Buffalo just six months later, the young married couple appear to be under the patronage of Sir James Malcolm, of Eskdale, Dumfriesshire, who, with his brother, Sir Pulteney Malcolm, had an interest in the new colony. Also travelling on the Buffalo was Mr William Malcolm.