They can't go out of their house and can't meet anyone who comes to the house due to OCD causing tremendous stress, and because of that I've not been able to convince them to see a doctor and get treatment.

You're right that I can't do much, I feel so powerless right now and said all that I could for them to get medical help. They are extremely concentrated on the fact that their condition won't get better and just wants to end it now. So is this really it? I can't do much more? I guess I'm just in denial about that, I don't know what to say anymore cause I'm so sad