In 1927, financed by a gift from Margaret’s mother, Louise Whitfield Carnegie, Miller had a 22-room stone ... fitted with a separate dining room for children. And with 10 bedrooms, nine ...

Margaret Carnegie Miller, the only daughter of industrialist Andrew Carnegie, completed a vast country estate for herself and her husband in 1927, in the quiet Hudson Valley retreat of Millbrook ...

They have four children—Louise C., Barbara, Margaret, Roswell III. Mr. Miller maintains a real-estate office in midtown Manhattan and a home adjacent to the garden of the Carnegie Fifth Avenue ...