Lady Mary Kerr born 1944; daughter of Peter Kerr, 12th Marquess of Lothian (b. 1944) Parents Antonella Kerr, Marchioness of Lothian Peter Kerr, 12th Marquess of Lothian Children Mark Graf von Westenholz Alexander Graf von Westenholz Nicholas Graf von Westenholz Siblings Lady Cecil Kerr Ralph Kerr, 14th Marquess of Lothian Elizabeth Scott, Duchess of Buccleuch Clare FitzRoy, Countess of Euston Michael Ancram Partners Charles Westenholz