My friend goes on about her son likely being tall - 6 foot 3 based on the UK growth chart. Would I be unreasonable in telling her that because she isn't very tall, this is unlikely to be the case and that the growth chart predictions are rubbish?
She is sold on the idea of her son being tall and her son has come to believe that too but I think that now he is approaching puberty, he may become very disappointed.
Should I just leave it be or should I give her a dose of reality?