This brief discusses how immigration policy keeps families apart and presents national data attesting to these family separations. Immigrants are more likely than natives to be married with spouse absent, their households are more likely to be headed by men with no wife present, and foreign-born children are more likely to be in nonchild relationships to the householder than natives. In a subset of foreign-born children with at least one parent in the United States, 21 percent were separated from their mothers and 34 percent from their fathers for 1 year or more.