In 1735 Augustine moved the family up the Potomac River to another Washington home, Little Hunting Creek Plantation (later renamed Mount Vernon). In 1738 they moved again to Ferry Farm, a plantation on the Rappahannock River near Fredericksburg, Virginia, where George spent much of his youth. Little is known of Washington's childhood, and it remains the most poorly understood part of his life. Popular fables illustrating his youthful honesty, piety, and physical strength have long taken the place of documented fact. Some of these fables are more plausible than others. The story that Washington threw a silver dollar across the Potomac River -- an impossible feat -- had its origins in the recollections of a cousin that George could throw a stone across the much narrower Rappahannock River. But others, including the familiar story of Washington and the cherry tree, seem to have been invented by one of Washington's first biographers, Mason Locke Weems.