Grant’s origins are obscure. He was said to be descended from the Grants of Gartenbeg, but no trace of him has been found in the published pedigrees of that family. According to Elizabeth Grant of Rothiemurchus, he was the son of a wadsetter and was ‘but poorly reared’.
Grant canvassed the government borough of Queenborough, in tandem with the independent Member John Capel, at the general election of 1830, but was ‘frightened out of the field’ by the prospect of an expensive contest.
Soon afterwards he inherited the principal Dorset estate of his wife’s sister’s husband Francis Browne of Frampton, near Dorchester, who died in March 1833 at the Weymouth house which Grant was then occupying. Browne left £10,000 and his property at Abbotsbury and Litton in remainder to Grant’s younger daughter Charlotte Augusta, but she died in Brussels a few months later.
