Lady Louisa Fitzmaurice daughter of William Petty, 2nd Earl of Shelburne, and Lady Louisa FitzPatrick Parents Louisa Petty, Countess of Shelburne William Petty, 2nd Earl of Shelburne Children Siblings Henry Petty-Fitzmaurice, 3rd Marquess of Lansdowne John Petty, 2nd Marquess of Lansdowne