„Recent studies have documented a sizable achievement gap between children who live with a single parent and their peers growing up with two parents. […] Documented disadvantages of growing up in single-parent families in the United States include lower educational attainment and greater psychological distress, as well as poor adult outcomes in areas such as employment, income, and marital status. Disadvantages for children from single-parent families have also been documented in other countries, including Canada, Germany, Sweden, and the United Kingdom.“
Univ.-Prof. Dr. Ludger Wößmann, „An International Look at the Single-Parent: Family Structure Matters More for U.S. Students“. In: „Education Next“ vom Frühjahr 2015, S. 43f