Marriage itself helps keep parents together

Marriage itself helps keep parents together¹, and Harry Benson, research director of the Marriage Foundation, says its benefits have been systematically underestimated in academic research and public policy². He spent four years reanalyzing the same UK Millennium Cohort Study used in some of the most influential British studies on family stability³.

The Institute for Family Studies wrote on X on October 29, 2026: “For more than 15 years, one interpretation has come to dominate discussion of marriage among family researchers and policymakers.” The Institute for Family Studies described the prevailing argument this way: “Yes, married parents are much more likely to stay together. But, as this argument goes, that's not because marriage makes any difference; it's because the kinds of people who marry were already more likely to stay together.”⁴ The UK Institute for Fiscal Studies analyses behind that view concluded that married parents stay together longer largely because they are older, better educated, and better off². That explanation let policymakers treat marriage as neutral.

“For more than 15 years, one interpretation has come to dominate discussion of marriage among family researchers and policymakers.”

Missing families changed the result

Benson first rebuilt the earlier work using essentially the same sample, comparison group and methods, and got almost the same headline result. Selection appeared to explain nearly all of the difference in family stability. The earlier analyses dropped around one quarter of otherwise eligible families because information was missing on one or more variables. The excluded quarter contained disproportionately more couples who never married or later separated. Multiple imputation, a method for keeping such cases rather than discarding them, was already well established by 2010³.

Restoring those families changed the answer. In the revised analysis of the earlier studies, selection no longer explained almost all of the difference in family stability.

Marriage predicts more stable homes

A University of Bristol doctoral thesis by Benson used logistic regression on 3,324 couples from the Millennium Cohort Study. The study covers the first fourteen years of parenthood among UK heterosexual couples, and it controls for twenty-seven social characteristics. It found that marriage, regardless of timing, reduces the risk of union dissolution compared to remaining unmarried. The thesis finds that social characteristics account for part of that association, and the remaining difference likely reflects underlying factors such as relationship commitment¹.

Comparing parents who eventually married with those who never did, Benson found that selection explained only around half or less of the difference in union dissolution. After adjusting for 27 socioeconomic, demographic, and relationship characteristics, marriage retained a substantial independent association with family stability³. Marriage still matters after the sorting is done.

Marriage can help create commitment

Benson writes that marriage may not simply reflect commitment; it may also help create it. His model draws on Scott Stanley's commitment theory, which holds that relationships built on explicit decisions generate stronger dedication than relationships that simply drift forward³.

The Marriage Foundation describes marriage as a commitment device that reinforces dedication, aligns behaviour with long-term intentions, and increases the costs of exit². The Bristol thesis makes the same point from the other side: for many couples, the act of marrying may help explain stability effects often attributed to unobserved selection factors¹. A decision that binds two people to a shared future is a policy fact, not a footnote to who they were before they chose it.

Policy should reduce barriers to marriage

The Marriage Foundation argues that reducing social and fiscal barriers to marriage could play a meaningful role in strengthening family stability². For years the selection argument let policymakers stand back, and a policy that looks neutral toward marriage is not neutral in its effect on families.

Family Brief's call is specific: end marriage penalties in tax and benefit programs, raise the child tax credit and add family deductions, and lower the housing and living costs that push marriage and children later. Ask every tax and benefit program one question before it passes: does it reward the married two-parent home, or penalize it?

Sources

1. The timing of marriage and risk of union dissolution among first time parents in the UK
2. The Timing of Marriage and Union Dissolution - Marriage Foundation
3. Same Data, Different Story: Rethinking Marriage and Family Stability
4. @FamStudies on X, 2026-10-29: For more than 15 years, one interpretation has come to dominate discussion of marriage among family researchers and policymakers. Yes, married parents are much more likely to stay together. But, as this argument goes, that's not because marriage makes any diff, 2026-10-29