Background: Parents with intellectual and developmental disabilities (IDDs) have a tendency to provide insufficient caregiving and often need parenting support to prevent neglect and child removal. However, parents with IDDs are not provided with appropriate support, and there is a lack of evidence-based programmes tailored to these parents' needs. Parenting Young Children (PYC) is a home-based parenting programme developed for parents with IDDs. PYC has shown promising clinical results in interview-based studies, but there is no evidence of its effectiveness. The purpose of the proposed study is to evaluate the PYC programme for improving parenting in parents with IDDs where there is risk of child neglect. The study will include a quantitative evaluation, a process evaluation, and a qualitative evaluation of the children's and parents' perspectives on participating in PYC.

Methods: The quantitative evaluation will have a multi-centre, non-randomised, comparative study design. Eligible for participation are parents with IDDs who have children aged 0-9 years living at home and who are assessed as needing tailored parenting support. Thirty parents receiving PYC and thirty parents receiving treatment as usual (TAU) will be recruited from Swedish municipal social services. Outcome variables will be examined before and after the intervention, with a follow-up 6 months after completing the intervention. The primary outcome will be goal-attainment in parenting skills, and secondary outcomes will be parental self-efficacy and children's wellbeing. Interview methods will be used to explore the perspectives of parents and children in the PYC group.

Discussion: This study is motivated by the need for evidence-based support for parents with IDDs, and it focuses on upholding the centrality of child-caregiver relationships and family preservation, as well as children's rights and the rights of people with disabilities. Social services have expressed ethical concerns with employing a randomized design for this vulnerable group, and this study will therefore evaluate PYC in a non-randomized comparative study.

Inclusion Criteria:

• Parents with IDDs, including ID and other cognitive disabilities (e.g., ADHD and ASD).
• Parents must have children aged 0-9 years living at home and be assessed by the social services to be eligible for tailored parenting support.

Exclusion Criteria:

• Ongoing substance abuse, and/or mental illness of such nature and degree that it may affect parent management training.
• Ongoing child abuse.