I don't personally know someone in that area, and I would just pick a name and send it to you if I don't know the person and possibly make matters worse. I did a search and came up with this list. I would go down the list and contact each person and ask them if they have counselors familiar with this type of situation. People who are familiar with addiction are the type of people you want to talk to. You can also contact the organizations here, here, here and here. Get a notebook, and for each organization you contact, give them a page. On that page you'll want to write who you spoke to, any references they give you, costs, location, phone numbers etc. Once you go over all of the people you called you can make choices based on how they helped you, what the costs are, etc
When a parent goes so far above and beyond for a child, there's usually a fair amount of guilt involved about something. The parent usually feeling like they didn't do something right, they did something wrong or they didn't do enough.He may need to get into therapy, but many times this isn't something that can accomplished....it's worth a try, if you think he would consider it.
Here's a few more links about MLM and how they coincide with 'cults' or a cultish way.
I welcome your thoughts, let me know if you want to talk more