DES MOINES, Iowa -- A home invasion at Rep. Leonard Boswell's Iowa farm ended when his 22-year-old grandson fetched a shotgun and aimed it at the intruder, according to a statement from the congressman's office. No one was seriously injured.The incident started about 10:45 p.m. Saturday when an armed man came in through the front door, attacked Boswell's daughter, Cindy Brown, and demanded money, the statement said.