It Takes Two 1995
Directed by Andy Tennant | Starring: Mary-Kate Olsen, Kirstie Alley, Steve Guttenberg, Ashley Olsen
Identical 9-year-olds from very different backgrounds: orphaned Amanda and wealthy Alyssa meet at summer camp and decide to switch places -- and play matchmaker between Alyssa's dad, Roger, and the kind social worker who cares for Amanda.