His mother was Amelia , daughter of John Warburton .
Elphinstone was the youngest son of John Elphinstone , a captain in the Royal Navy and for a period a vice-admiral in the Russian Navy .
Elphinstone 's mother was Amelia , daughter of John Warburton .
Elphinstone was the youngest son of John Elphinstone , a captain in the Royal Navy and for a period a vice-admiral in the Russian Navy .