Who is Douglas Gardiner from --and Ladies of the Club and what is their importance?

Douglas Gardiner is Caroline and Lavinia's nephew. He is described as a socially shy, young man, who is extremely self-consciousness about his club foot. Douglas is, however, outspoken about things that are important to him, which is evidenced in his stance opposing the black vote. Over the course of the novel, Doug makes a good career for himself in law and politics. He marries Barbara Bodien.