His sister, Susan Linn Sage (1866--1933) married James Fenimore Cooper (1858--1938), grandson of prolific author James Fenimore Cooper (1789--1851). Susan and James were the parents of Paul Fenimore Cooper (1899--1970), an author and Henry's nephew. After graduation from Yale, he began working in the lumber business, like his father and grandfather.
Paul Fenimore Cooper
Henry