Roni Sutton and her husband, Richie, raised three sons into adulthood. But their offspring aren't the only people who call them "mom" and "dad." A dozen other young men and women spread around Earth also address the couple using those terms. That's because the Suttons spent years hosting foreign-exchange students in their Montvale home. More recently, Roni Sutton has levered that experience into a job as "chapter leader" with a nonprofit called Foreign Links Around the Globe, or FLAG. Since 1989, the U.S. State Department-accredited organization has overseen housing, care and education for mo...