Inclusion Criteria:  ≥ 5 non-suicidal self-injury episodes in the past year and ≥ 1 non-suicidal self-injury episodes in the past month assessed by the Deliberate Self-Harm Inventory, Youth version (DSHI-Y). Age-appropriate literacy assessed by referring clinicians and the self-injury team, i.e. age between 13 and 17. Having at least one parent committing to participate in the parent program. Informed consent from parents/legal caretakers and assent from participants above 15 years of age.  Exclusion Criteria:  Imminent suicidal risk assessed by clinicians during routine screening procedure (that can be rated as no risk, elevated risk, or imminent risk) in need of admission or other life saving strategies. Lack of informed consent from parents/legal caretakers. Lack of informed assent from the participant above 15 years of age.