Who is Sara Roosevelt from Eleanor Roosevelt: A Life of Discovery and what is their importance?

Sara Roosevelt, Franklin's mother, was very dependent upon her son after the death of her husband. She approved of Eleanor, but made the couple keep their engagement a secret for a year to make sure they were doing the right thing..... that they shared a true and lasting love. Sara served as the matriarch of the Roosevelt home for many years, dominating Eleanor and overseeing the running of her household.