I have a set of twin nieces, 3 years old. One of them is the worst behaved child I have ever seen. My poor sister is at the end of her tether, I really don't know how she copes. Today was the worse to have seen, I have a 6 month old baby, he was on the floor today, she is usually very good with him. Today she was getting no attention, my sister and I were talking, she came over to the baby and purposely dropped a mug next to the baby, just missing babies head, she got told off and put on the naughty step, she would not apologise, she will sit there all day, she will even sit in her room for up to three hours before saying sorry! She uribates herself for attention, she bites other kids for attention. My sister thinks she has a behavioural disorder, I don't know if it's just naughtiness. Any one else had a child like this ? What punishment works? She just doesn't seem to care about anything.