Even if various parenting skills training programs (PSTP) are evidence-based, they do not always succeed in engaging families who need it most. The general objective of this study is to better understand issues related to engagement in PSTP for families where parents are struggling with alcohol or another drug addiction. Coming from four Quebec rehabilitation centres, the sample is composed of 47 families who initially agreed to participate in PSTP. Of these families, 18 did not complete the program. The results indicate that, compared to parents who have completed the program, those who have dropped out are characterized by a worse job status, lack of parental supervision, lack of communication between family members, and family dysfunction. In addition, families who dropped out of the program experienced more stress during the previous year. The results suggest indicators to identify families at risk of abandoning PSTP and also guide the development of therapeutic strategies to facilitate parents’ engagement in services.