Your son's grandparents are being very unfair and are undermining your authority with your son. You are trying to teach him good habits and healthy eating habits which is very good. These colddrinks contain lots of sugar, artificial flavourants, possibly caffeine and are very acid. You are right to advise your son that he should drink healthy drinks in preference.As your son's mother he should definitely listen to your advice. You will have to be firm with his grandparents. If they do not respect your wishes regarding your son's diet then he cannot visit them until they are prepared to do so.
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