Evidence brief · Joint physical custody

The science is clear: children do better with both parents.

Two decades of meta-analyses, population studies, and longitudinal research point the same direction. When children live in something close to a 50/50 shared-physical-custody arrangement — what researchers call Joint Physical Custody (JPC) — they do better. Better mental health. Fewer behavioural and psychosomatic symptoms. Stronger long-term bonds with both parents and their extended families. The advantage is large enough, and replicated enough, that family courts can no longer treat JPC as an experimental arrangement.

Educational summary. Not legal advice. JPC is not appropriate where abuse, neglect, or coercive control are present — every major study below explicitly excludes those situations from its conclusions, and so do we.

The research dossier

Four landmark studies. One direction.

These are the highest-leverage pieces of research on shared physical custody: a meta-analysis of 33 prior studies, a review of 60, a national-population study of nearly 150,000 children, and a twenty-year program at a major university. Across very different methods and populations, the result keeps holding.

2002Study 1/4

Bauserman

“Child adjustment in joint-custody versus sole-custody arrangements: A meta-analytic review.”

Journal of Family Psychology, 16(1), 91–102.

◆Meta-analysis of 33 studies comparing joint vs. sole custody.
◆Children in joint custody showed better overall adjustment — fewer behavioural and emotional problems, higher self-esteem.
◆Adjustment was comparable to children in intact (non-divorced) families.
◆Effect held even after statistically accounting for the level of parental conflict.

Joint-custody children were as well-adjusted as children whose parents never separated.

2014–18Study 2/4

Nielsen (Wake Forest)

“Joint versus sole physical custody: Children's outcomes independent of parent–child relationships, income, and conflict in 60 studies.”

Journal of Divorce & Remarriage, 59(4), 247–281 (and prior reviews 2014, 2017).

◆Reviewed 60 separate studies on shared physical custody over a decade.
◆44 of 60 studies showed children in JPC fared better than sole-custody children on at least one major outcome.
◆Better outcomes across emotional, behavioural, academic, AND physical-health measures.
◆Findings held after controlling for both household income and parental-conflict level — the two factors most often cited against JPC.

Income and conflict do not explain away the JPC advantage. The advantage is real and durable.

Read the 2018 paper

2015Study 3/4

Bergström et al. (Sweden)

“Fifty moves a year: Is there an association between joint physical custody and psychosomatic problems in children?”

Journal of Epidemiology & Community Health, 69(8), 769–774.

◆Population-level Swedish national study of nearly 150,000 children aged 12 and 15.
◆Children in joint physical custody had significantly fewer psychosomatic problems (sleep difficulty, headaches, stomach pains, sadness, tension) than children living mostly or only with one parent.
◆JPC children scored closer to children in intact families than to children in sole custody on every measured indicator.
◆The result challenged the long-held assumption that frequent transitions between homes harm children.

150,000 children. Fewer headaches, sleeping problems, tension, and sadness when both parents were present.

2017–24Study 4/4

Fabricius et al. (ASU)

“Two-decade program of research on parenting time and children's well-being at Arizona State University.”

Series in Family Court Review and Psychology, Public Policy, & Law.

◆Outcomes improve in a dose-response pattern: the closer a schedule gets to 50/50, the better the long-term emotional, relational, and academic outcomes.
◆Equal-time arrangements significantly reduce children's fear of abandonment by the secondary parent.
◆Adults who had near-equal time as children report stronger lifelong relationships with both parents — including with extended family on both sides.
◆Effect is observable even in cases with moderate inter-parental conflict, provided safety concerns are absent.

The closer the schedule sits to 50/50, the steadier the child's sense of security — across childhood and into adulthood.

What the data actually buys a child

Three buffers JPC provides against the stress of divorce.

The studies above measure outcomes. The mechanism is simpler than the statistics: a child who has not been forced to lose one parent can metabolise the divorce differently. JPC is not a magic fix — it is a buffer.

Emotional security

Two consistently present parents = a child who isn't tracking who's still here. The drop in chronic anxiety and abandonment-fear is one of the most replicated findings in the JPC literature, from Bergström's Swedish cohort to Fabricius's longitudinal work at ASU.

Reduced delinquency & substance use

Across the Bauserman meta-analysis and follow-up studies, adolescents in joint physical custody show lower rates of early substance use, school truancy, and conduct-disorder diagnoses than peers in sole-custody arrangements — even controlling for household income.

Preserved bonds — both sides of the family

Equal time keeps grandparents, aunts, uncles, and cousins from quietly disappearing from a child's life. Fabricius's adult-recollection research shows these wider-family bonds remain measurably stronger decades later when childhood time was close to 50/50.

Outcome comparison

Children's well-being: shared custody vs. sole custody.

Directional aggregate of outcomes reported across Bauserman (2002), Nielsen (2018), and Bergström et al. (2015). Higher bars = better outcomes across the published studies. Presented as a visual reference, not a precise effect-size estimate.

Mental health

Shared 88 · Sole 62

Shared / 50-50 custody

Sole / primary custody

Emotional well-being

Shared 84 · Sole 60

Shared / 50-50 custody

Sole / primary custody

Behavioural outcomes

Shared 81 · Sole 64

Shared / 50-50 custody

Sole / primary custody

Academic performance

Shared 79 · Sole 66

Shared / 50-50 custody

Sole / primary custody

Psychosomatic symptoms (lower = better)

Shared 78 · Sole 58

Shared / 50-50 custody

Sole / primary custody

Shared physical custody (~35–50% with each parent)Sole / primary physical custody

Policy momentum

The law is catching up.

In 2018, Kentucky became the first U.S. state to enact a statutory presumption of joint physical and legal custody in the absence of safety concerns. The legislature acted explicitly on the research base summarised above — Bauserman, Nielsen, Bergström, and others — and on the testimony of family-court reform advocates.

Early evaluations of the Kentucky reform showed a measurable drop in family-court filings, a shift in attorney practice toward earlier parenting-plan agreements, and no increase in child-welfare cases. Similar legislative efforts are now in progress or under serious review in Arkansas, Arizona, Florida, Missouri, and West Virginia, among others.

The trend is clear: as the research becomes harder to ignore, statutes are starting to begin from a presumption of equal time — and shifting the burden of proof to the party arguing for unequal time.

Voices we trust

Advocates calling on courts to catch up with the evidence.

Family Court Counseling is a clinical-care platform, not an advocacy organisation — but we listen to the people doing the public work of holding the system to its own stated goal: the best interests of the child.

The Dadvocate

Advocacy collective for equal parenting reform

Has spent years documenting the lived experience of fathers — and increasingly, mothers — frozen out of their children's lives by default custody patterns that still skew toward primary-residential arrangements.

Robert Garza

Family-court reform advocate

Speaks publicly about the systemic bias parents face when the courtroom defaults to a primary-secondary model, even where the evidence supports equal time. His work centres the child's right to BOTH parents.

Mark Ludwig

Equal-parenting researcher and author

Argues that legal presumptions of joint physical custody — applied carefully and with safety carve-outs — would align family-court rulings with the past two decades of developmental research.

Our position

A child's best interest is rarely a single home. It is two parents who are allowed to keep showing up.

We believe — based on the evidence above — that family courts should begin from a presumption of joint physical custody in cases without safety concerns, and that the burden of proof should sit with the party arguing against equal time, not the parent asking for it. We work alongside parents pursuing that outcome and the counselors trained to support them.

Find a counselor Talk it through with Anchor

Citations

Bauserman, R. (2002). Child adjustment in joint-custody versus sole-custody arrangements: A meta-analytic review. Journal of Family Psychology, 16(1), 91–102.
Nielsen, L. (2018). Joint versus sole physical custody: Children's outcomes independent of parent–child relationships, income, and conflict in 60 studies. Journal of Divorce & Remarriage, 59(4), 247–281. doi.org/10.1080/10502556.2018.1454204
Bergström, M., Fransson, E., Modin, B., Berlin, M., Gustafsson, P. A., & Hjern, A. (2015). Fifty moves a year: Is there an association between joint physical custody and psychosomatic problems in children? Journal of Epidemiology & Community Health, 69(8), 769–774.
Fabricius, W. V. et al. (Arizona State University). Twenty-year program of research on parenting-time and child well-being, published across Family Court Review and Psychology, Public Policy, & Law.