The dispute revolves around Dialta Alliata di Montereale, above, a wealthy 70-something mother-of-five, who lives in California and Hawaii and is married to a Sicilian prince.She claims to be the illegitimate granddaughter of the late Sir Harold's father, Arthur, and argues that this makes her the rightful heir to a hefty portion of his magnificent estate, which has been valued at upwards of £800...