Lady Isobel FitzRoy born 1985; youngest child of James FitzRoy, Earl of Euston, and Clare FitzRoy, Countess of Euston (b. 1985) Parents Clare FitzRoy, Countess of Euston James FitzRoy, Earl of Euston Children Siblings Henry FitzRoy, 12th Duke of Grafton Lady Charlotte FitzRoy Lady Louise FitzRoy Lady Emily FitzRoy