The thing is, it's her brother she's bullying, if that's the correct term for her behaviour.
She is hostile towards him 90% of the time, regardless of his behaviour towards her. She refuses to answer when he speaks, makes faces and calls him disgusting at mealtimes (and that's every mealtime), and is generally cold and unpleasant towards him. The thing is, this has been going on for well over a year.
Of course they scrap often, as siblings do, but this is different. It's a sustained campaign that has been going on for so very long. It's very subtle and is definitely affecting his self-esteem. I've tried to talk to her without success, and I've run out of ideas.
Is it bullying?
Any ideas?