McMaster University's Pioneering CHIRP Study Sheds Light on a Hidden Crisis

The Children with Incarcerated Parents (CHIRP) study, led by researchers at McMaster University, marks a watershed moment in Canadian social science research. Published in PLOS One on April 8, 2026, this first-of-its-kind analysis uses linked administrative data to quantify the number of children under 18 who experience parental incarceration. For years, these children have been statistically invisible, complicating efforts to design targeted interventions in education, health, and child welfare. By harnessing Statistics Canada's Social Data Linkage Environment, the study provides minimum estimates that underscore the urgent need for policy action.

Lead researcher Fiona Kouyoumdjian, an associate professor in McMaster's Department of Family Medicine, collaborated with experts from Simon Fraser University, Trent University, the University of British Columbia, University of Calgary, University of New Brunswick, University of Regina, and University of Toronto. This multi-institutional effort highlights the power of Canadian higher education networks in tackling complex societal issues. Funded by the Canadian Institutes of Health Research (CIHR), the project exemplifies how university-led research can inform national discourse on children's rights and criminal justice reform.

Unveiling the Methodology: Linking Data to Reveal the Unseen

The CHIRP study analyzed data from the Canadian Correctional Services Survey, covering all provincial correctional facilities in British Columbia, Alberta, Saskatchewan, Ontario, and Nova Scotia from April 1, 2015, to December 31, 2021. Researchers identified children using three robust methods: birth certificates listing the incarcerated person as a parent, child tax benefits received by the parent, and hospital discharge records for live births by female inmates.

This deterministic and probabilistic linkage process yielded precise minimum estimates, accounting for factors like child age (<18 at first parental incarceration) and survival status. Limitations, such as missing data on federal prisons, territories, and non-biological parents, suggest the true figure is higher. The methodology sets a gold standard for future studies, demonstrating how administrative data can bridge gaps in vulnerable population research—a boon for criminology and public health programs at Canadian universities.

Staggering Numbers: Nearly 170,000 Children Impacted Across Five Provinces

Between 2015 and 2021, 169,740 children under 18 experienced parental incarceration in the studied provinces. Annually, approximately 1.2% to 1.3% of children were affected, equating to rates of 228.6 to 250.3 per 100,000 population. Per day, up to 12,649 children had a parent behind bars in 2017.

Of these children, 87.4% had one incarcerated parent, 12.0% two, and a median exposure of 60 days (mean 166.5 days). Notably, 25.3% endured four or more episodes, amplifying trauma. For every 10 incarcerated adults, 6.5 to 7.4 children were affected, far exceeding European Union rates of 178 per 10,000 people.

Demographic Disparities: Overrepresentation Among Indigenous and Black Families

The study reveals stark inequities. Among affected children, 30.5% had at least one Indigenous parent, and 5.9% at least one Black parent—mirroring broader overrepresentation in Canada's justice system, where Indigenous adults are incarcerated at rates 10 times higher than non-Indigenous in some provinces. Parents were 77.4% male and 22.6% female, with Ontario (47.3%) and Alberta (27.7%) bearing the heaviest burden.

• Indigenous parents: 31.6% of incarcerated parents of minor children
• Black parents: 6.0%
• Child age at first incarceration: 32.6% under 4 years, 30.4% ages 5-9

These findings call for Indigenous-led research frameworks, as urged by co-author Christine Bentley-Wang from McMaster's Department of Pediatrics.

Long-Term Impacts: Health, Education, and Intergenerational Trauma

Parental incarceration qualifies as an Adverse Childhood Experience (ACE), linked to poorer physical health, higher mortality, academic struggles, and mental health issues like anxiety and depression. Children often face compounded risks from family violence, substance use, poverty, and homelessness. In Canada, this fuels cycles of trauma, particularly for Indigenous children overrepresented due to systemic factors like colonial legacies.

Research from other Canadian universities, such as Trent and UBC collaborators, echoes global patterns: affected youth are 2-4 times more likely to enter the justice system themselves. Universities play a pivotal role in training educators for trauma-informed practices, vital for higher education's future workforce in social services.

Comparing Canada to Global Contexts

Canada's rate (229 per 10,000) surpasses the EU's 178, highlighting incarceration-heavy policies. U.S. studies estimate 5 million affected children, but Canada's lack of national data lagged behind. The CHIRP study positions McMaster as a leader, akin to European efforts using linked data.Read the full PLOS One paper

Policy Recommendations: From Data to Action

The United Nations Committee on the Rights of the Child urged Canada in 2022 to improve data collection. CHIRP responds, advocating national datasets including federal prisons and territories. Recommendations include preventing incarceration via alternatives and supporting families through evidence-based programs.

University Initiatives: Research and Support Programs

Canadian universities are stepping up. McMaster's CHIRP paves the way for expanded criminology and social work curricula. Trent University's research on youth experiences and King's University College's Ephesus Project offer prison education linking to child support. The Canadian Coalition for Children with Incarcerated Parents (CCCIP) partners with academics for advocacy.

Programs like KIP Canada provide counseling and transport, while university scholarships from CFCN aid postsecondary access for affected youth.

Expert Voices: Quotes from the Research Team

"Parental incarceration disrupts family bonds and fuels intergenerational trauma—a violation of children’s rights," says Christine Bentley-Wang. Nancy Russell of CCCIP adds, "Routine data collection is key to supporting families."

Future Outlook: Expanding Research and Interventions

Next steps include full national coverage and equity-focused studies. Universities must integrate these findings into teacher training and public health programs, fostering resilient futures for these children. With collaborative efforts, Canada can mitigate this crisis.

This McMaster-led breakthrough not only quantifies the problem but galvanizes higher education's role in solutions, ensuring no child remains invisible.

Photo by Tim Wildsmith on Unsplash