My personal opinion on this is if the young man and the parents are fully informed on both methods and aware of possible consequences and want to go with the alternative treatment, he should be allowed to do so. At most they could have them sign a form that they are going against medical advice (for lawsuit purposes), but I believe this is too much interference into something that is a personal choice for the family involved. If the young man himself wanted chemo but the parents weren't allowing him and forcing the alternative, that'd be a different situation and I could see legal involvement then.