This is a difficult question because you will have to decide how you want to treat the person with OCD from today forward.
If the person does not want any help, and the person’s OCD does not interfere very much with his or her life or your life, then there is probably not much that you can do. However, if the OCD is interfering significantly, you do have some options.
First, let the person know that you are going to stop being a part of his or her rituals. If this person asks you to check things for him or her or asks for you to provide reassurance, tell the person that you are going to stop doing this because it’s making his or her OCD worse instead of better, and your participation in his or her rituals is giving them the message that you also feel as if the ritual is important when, actually, you do not.
Second, slowly stop making accommodations for the person’s rituals. For example, if your child is always late for school due to performing certain morning rituals, and you call them in with an excused absence every morning, consider not calling them in and therefore having them face the consequences of being late for school.
Third, let the person know that if he or she is not going to seek help, you are going to talk to someone about it. A therapist can sit down with you and talk to you about your specific situation and discuss what options may be best for you to help you stop accommodating the person with OCD in your life.
Fourth, there may be support groups in your area for family members of OCD sufferers that you can join. The other members may be able to give you tips on living with a person with OCD who does not want help, or they may have some good ways to help convince the OCD sufferer to get help.
Finally, stick with your plan. As hard as it may be, and as much as the person may plead with you to help him or her, keep in mind that every time you accommodate one of his or her rituals, you are sending a message that the OCD is correct and that it needs to be accommodated. This is simply not true.
Let your loved one know that you are supporting him or her, but that you are not supporting the OCD, and when he or she is ready to challenge the OCD, you will be happy to assist in any way that you can.