For most of the twentieth century, family courts assumed mothers should have primary custody and fathers should pay support and visit. That assumption has softened, but the legal default in many states still tilts hard toward primary-parent arrangements. The research has caught up to a different conclusion: barring abuse or unfitness, kids generally do better with substantial time with both parents — and the law should reflect that.
The research has converged
A 2014 review by Linda Nielsen of more than 40 studies found that children in shared-parenting arrangements scored better on measures of academic performance, mental health, behavioral problems, and relationships than children in primary-mother arrangements, even after controlling for parental conflict and income. A subsequent body of work, including Warshak’s 2014 consensus statement signed by 110 researchers, supported the same conclusion: shared parenting is generally beneficial for children of all ages, including young ones, when both parents are minimally competent. Critics argue the studies often involve self-selecting families. That’s a fair caution, but the size and consistency of the effect across populations is hard to dismiss.
The current default produces predictable harms
When one parent — historically and still usually the mother — gets primary custody, the other parent’s role often atrophies. Visitation schedules of every other weekend amount to roughly four overnights a month, which makes deep involvement in homework, friendships, and routines nearly impossible. Children of divorced parents disproportionately report missing the noncustodial parent, and adult children frequently describe the limited contact as a lasting wound. Fathers in particular often disengage over time, not because they want to, but because the structure makes engagement difficult. The financial structure compounds it: support obligations are calculated against limited time, locking in the arrangement.
Defaults shape outcomes more than people realize
Most divorces don’t reach a contested custody trial. They settle in the shadow of what a court would likely order. When the default presumption favors primary custody, parents negotiate from there. Switching the default to roughly equal time — rebuttable when one parent is abusive, absent, or unfit — would shift the negotiating baseline and produce more genuinely shared arrangements without taking away judicial discretion in real cases. Kentucky adopted a presumption of joint custody in 2018 and reported declines in family-court filings and conflict measures. Arizona, Arkansas, and a growing number of states have moved similarly.
The objections are real but addressable
Domestic violence advocates rightly worry about presumptions that pull abuse victims into mandatory contact with abusers. Any 50/50 default has to include clear, evidence-based exceptions for abuse, neglect, and high-conflict patterns. Logistics — work schedules, school districts, distance — also limit equal time in some cases. A presumption isn’t an inflexible rule; it’s a starting point. Courts retain authority to deviate when the evidence warrants.
The takeaway
Children generally benefit from real, sustained relationships with both parents. The legal default in most states still treats that as a privilege the noncustodial parent earns rather than a baseline kids deserve. The evidence has moved. The statutes should follow.
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