scoliosis

My 13 year old nephew has scoliosis. Do you think that this might be a nutritional deficiency? Would BF&C work for him even if he does not change his diet. I have tried for about 2 years to get my sister to change their diet but it has not worked. At one point he had itching all over his body, I paid him to drink some juices and to take some parasite herbs and the itching went away. But I know that I cannot get him to change his diet, so am trying to find something that might help him even thought I thoroughly understand that the diet is everything.
Any insight would be appreciated.