His paternal grandfather was botanist Charles Sprague Sargent , the first director of the Arnold Arboretum at Harvard University .
He was the son of Charles S. Sargent and his wife .
son 's paternal grandfather Charles S. Sargent Charles S. Sargent     Sargent , the Charles S. Sargent director of the Arnold Arboretum at Harvard University .
He was the son of Charles S. Sargent and his wife .