Family Accommodation Reduction in Adult Obsessive Compulsive Disorder: A Randomized Controlled Trial

The goal of this clinical trial is to learn if offering a Family Accommodation Reduction (FAR) intervention to family members before OCD patients start CBT can improve CBT outcomes. The current study will offer 6 sessions of Family Accommodation Reduction (FAR) or OCD psychoeducation for the family member before the person with OCD receives 12 sessions of group CBT (GCBT). The main questions it aims to answer are: * Is the addition of FAR associated with superior outcomes at the end of standard GCBT and at 3 month follow up in comparison to our control group? * Is reduction in Family Accommodation a mechanism by which FAR is impacting the outcomes of GCBT? Researchers will compare CBT outcomes between people whose family member received the FAR intervention versus psychoeducation and see if any benefits last at a 3-month follow-up. Participating Family Members will: * receive 6 weeks of FAR or Psychoeducation * answer online questionnaires at several time points throughout the study about OCD symptom severity, quality of life, and level of functioning for the person with OCD. Participating Patients will: * complete 12 weeks of CBT for OCD * answer online questionnaires at several time points throughout the study about OCD symptom severity, quality of life, and level of functioning.

Inclusion Criteria: Patients with OCD: 1. 18-65 years 2. primary diagnosis of OCD based on DSM-5 3. clinically significant obsessive compulsive symptoms (Yale-Brown Obsessive-Compulsive Scale, 2nd edition \> 20) 4. if on medications for OCD, must be on a stable (at least 6 weeks) prior to the initiation of the study. Family members: 1. 18-65 years old 2. has been sharing accommodations with the patient for a minimum of 9 of the last 12 months 3. is a parent, spouse, partner, sibling or an adult child of the patient with OCD 4. reports at least moderate Family Accommodation levels based on the Family Accommodation Scale for Obsessive-Compulsive Disorder-Self-Rated Version score\>14 (Pinto et al., 2013) 5. no known current diagnosis of schizophrenia, bipolar disorder or organic brain illness (which will be asked about in the Family Member Phone Screen) 6. has access to a Zoom capable device, a stable internet connection, and a private location to attend sessions. Exclusion Criteria: Patients with OCD: 1. severe mood disorder, schizophrenia/psychotic disorders or significant substance abuse/dependence 2. suspected organic pathology 3. full course of CBT for OCD within the past year (i.e., more than 8 sessions) 4. an active comorbid medical condition that may require urgent intervention during the treatment. Participants incapable of providing informed consent will be excluded.