They should have taken care of it earlier...A child learns most of his habits by the age of 6..that first 6 years really counts...now that he is 12..ask you friend to take him for counseling. I am sure they can help him.

Parents should show more interest in his home work and daily lessons..and spent time with them..that. You can’t watch TV and expect you child to study...you should be the role model for them. If you tell lies in front of children...you cant expect the child to tell the truth...