Like "No you dont but it does help to have one or the other on board. As far as legal issues you would need to have to check that out. You could start up a group in your local library perhaps. It would help to be able to Weight Watchers but I dont know. They'd want to do it by their curriculum. Its a great idea but I'd would want to find out in my community who all would be interested. If they are able to attend what days and time frame. Plus have maybe some snacks on hand diabetic friendly. Check out with the American Association of Diabetes they may know of one. Hope this helps as it was meant too. Hugs"