Ethel Kennedy, the widow of Robert F. Kennedy, has again cut the asking price on her McLean, Va., estate, this time to $12.5 million, from $25 million when it went up for sale in 2003. John F. Kennedy and his wife, Jackie, bought the 12-bedroom mansion in 1953 shortly after he joined the U.S. Senate. In 1957 the future president sold the home to his brother, who raised his 11 children there. Set on more than five acres, the 19th-century mansion has 18 rooms, 10½ baths and 12 fireplaces. The property also includes a pool, pool house, tennis court and...