Uncle Sam - Cindy's already explained that Russell had had to leave the States because he'd over stayed his visa, and the family were planning to live in Australia; then the Australian authorities decided that since Jessica was disabled they didn't want to have any future responsibility for her, and the fact that she had been born in the States gave them an opportunity to get rid of her. And now the US authorities won't allow Russell to immigrate because he broke the rules last time by overstaying his visa.