Lady Louisa Spencer (1769-1769); youngest child of John Spencer, 1st Earl Spencer, and Georgiana Poyntz (1769–1769) Parents Georgiana Spencer, Countess Spencer John Spencer, 1st Earl Spencer Children Siblings Georgiana Cavendish, Duchess of Devonshire George Spencer, 2nd Earl Spencer Henrietta Ponsonby, Countess of Bessborough Lady Charlotte Spencer