My step-sister is 3 years old, and by god she is a ratty child! Her language skills are very under-developed for someone her age, and she very rarely does what she is told. She is extremely loud and boisterous, cannot sit still or quietly, is very destructive, swears, yells, screams, and cannot play nicely with other children as she is very rough. A clean room can quite easily become a disaster zone within minutes. We have given up cleaning her room, as she pulls clothes and toys out as soon as we have finished. She is also up to 10-11 o’clock at night.

She often dances and sings and often makes references to people's private parts as well as other embarrassing things, and we have cause to believe that these actions are done for attention (even though it is the wrong kind of attention).

I have cause to believe that food additives have a strong part to play in this due to her lax diet. She is spoilt and gets what she wants, from chips, lollies, chocolates, ice creams, and soft drinks. She has quite a lot of milos everyday, I once counted 4 in one morning! If she is not drinking milo, she is having soft drink, cordial or juice. She very rarely eats any un-processed foods or drinks any water.

Our dinner times are healthy, generally consisting of vegetables, a salad and some source of meat, or sometimes spaghetti bolognaise. She refuses to eat any of it, and shortly after dinner demands some kind of snack-type food.

My mother is finding her daughter’s behaviour extremely unbearable, even becoming embarrassed to take her out in public. My mum’s struggle to keep her sanity has increased since recently giving birth, making it extremely difficult to look after the baby and put up with my sister.

I need your advice to convince my parents that my sister’s diet is not ok, and drastic changes are needed. – by email from a teenager who wins a copy of our DVD Fed Up with Children’s Behaviour. Here’s hoping it will help with the family situation.

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