Summary from Wikipedia

Edward Gibbon was born in 1737, the son of Edward and Judith Gibbon, at Lime Grove in the town of Putney, Surrey. He had five brothers and one sister, all of whom died in infancy. His grandfather, also named Edward, had lost his assets as a result of the South Sea bubble stock-market collapse in 1720 but eventually regained much of his wealth. Gibbon's father thus inherited a substantial estate.[3] His paternal grandmother, Catherine Acton, was granddaughter of Sir Walter Acton, 2nd Baronet.[4]