Son of Sir William Rothenstein to marry artist . The engagement is announced of Mr Michael Rothenstein , the artist son of Sir William Rothenstein , who until he retired last July , was Principal of the Royal College of Art for 15 years . Mr Rothenstein , who is 26 , is to marry Miss Betty Fitzgerald , also an artist , the twin daughter of Mrs L Fitz Gerald of London . Photo shows , Miss Betty Fitzgerald making a pencil sketch of her fiance , Mr Micheal Rothenstein at his London studio . 26 September 1935