It can be very helpful to involve the entire family in therapy.
Many people with OCD feel as if they are suffering alone. With the support of the entire family, they can feel encouraged to make the changes needed to improve.
But the best part of having the family involved in treatment is the opportunity to get them all on the same page about what to do in response to a ritual or an obsession.
When the entire family meets with the therapist, they all can ask questions and get information without hearing it second or third-hand. And the therapist can work with all of them and teach them about avoidance and reassurance-seeking.
The therapist can also design exposures in which the entire family can participate.