Parents try everything to influence their children. But new research suggests that brothers and sisters have their own profound impact.Susan Dominus, a staff writer for The New York Times Magazine, discusses the surprising ways that our brothers and sisters shape our lives.Guest: Susan Dominus, a staff writer at The New York Times Magazine covering a broad range of topics. Her recent article was adapted from her book, “The Family Dynamic: A Journey Into the Mystery of Sibling Success,” which was published by Crown on May 6.Background reading: