My 7 year old can be quite rude to her Grandma. She's a bit sassy at times, but she's never this rude to anyone else.
Grandma has a very close relationship with my youngest. Youngest is very sweet, affectionate, loving, never plays up. My eldest is absolutely wonderful but is not particularly loving, not affectionate and has quite a dark sense of humour. I absolutely love her humour but her Grandma doesn't. She looks at her with disgust when she says some things and then my Daughter plays on it and tries to say things that will annoy her more.
I don't know if it's because she senses the close relationship my youngest has with her, or if she just doesn't like her because she's so serious about her dark sense of humour.
Does anyone have any tips about how to resolve this, and what sort of punishment might be suitable? I really need to reign this behaviour in.