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 ...

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 ...

A sprawling British-inspired castle owned by the Carnegie ... on Margaret’s name, but her ex-husband, Roswell Miller, ended up getting the castle when they divorced. The couple had four children.