John Pratt, 5th Marquess Camden British peer (1899-1983) (1899–1983) Parents Joan Pratt, Marchioness Camden John Pratt, 4th Marquess Camden Children David Pratt, 6th Marquess Camden Lord Michael Pratt Lady Mary Pratt Siblings Lady Irene Pratt Lady Fiona Pratt Lord Roderic Pratt Partners Averil Streatfeild Marjorie Pratt, Countess of Brecknock Rosemary Pratt, Marchioness Camden