my brother will not eat!?

[Tweek]

my brother is 14 in feb. he is very short for his age but in the normal range for weight.. he looks thin however. since he was 3 he won't eat anything but hot chips. he won't try anything either. he is under a psychologist's care and they aren't working too well. mum wont make him eat she says she has tried everything and she cant handle to temper tantrums. its getting to me though cause when shes going through about $100 a week in take away chips for him not only is it unhealthy.. its expensive. he is not willing to try food. and if mum runs out of money i have to buy them and if i dont everyone hates me for it