Lucy de Thweng Peerage person ID=616792 Parents Isabel de Ros Marmaduke Thweng, 1st Baron Thweng Children William de Lumley Marmaduke de Lumley Siblings Thomas Thweng, 4th Lord Thweng Marmaduke de Thweng Robert de Thweng, 3rd Lord Thweng William de Thweng, 2nd Lord Thweng Katharine Thweng Partners Sir Robert de Lumley