My brother was diagnosed with OCD about two years ago and is following treatment. He lives with our parents (we're both 20-ish years old, but I moved out years ago). He has some conspicuous compulsions that are obviously interfering with his daily life, such as needing to perform some repetitive actions when moving from one room to another or when leaving the house or coming in. So, he gets a lot of help from our parents (fetch me that, bring me that, that kind of stuff).
This also adds difficulty when performing some mundane activities, such as dressing and brushing teeth. He also doesn't do any chores or help out our parents.
He has a social life, as he doesn't show a lot of conspicuous signs of OCD when he is outside.
His doctor recommended therapy, but he doesn't want to do it.
He had one session but the therapist said he has to want to go of his own initiative and not go because other people told him to.
He also spends a lot of time on the computer (mostly games) and has few hobbies or interests that could potentially turn into a career later on. He is in college right now, but he doesn't seem to have a genuine interest in it and is just getting passing grades.
I tried to tell my parents to stop offering so much help (fetching things) because as far as I can tell that is enabling his compulsions, but I can't do much except offer my parents advice, as I live in a different city.
What can my parents do to help motivate him to better himself, both in regard to working to treat his OCD and also to become a more productive/generally better person?
I'm looking for answers from anyone who has had any experience with OCD, but any advice is welcome.
Edit: What I was hoping to get out of this question were some actual examples of ways my parents could change their interaction with my brother in order to help him. One example I can think of is how I advised them to stop fetching water/food/whatever, to motivate him to get up and move through the house (i.e. to stop enabling his compulsions).