My son is 12 and has turned vile VILE. Rude silly disrespectful, cheeky, nasty to younger sibling. Smirks when told off for this behaviour. Tries to deny the behaviour when sanctions are in place. also says things when we speak to him about his behaviour such as “oh I’m awful”, “you think I’m stupid” etc etc. I don’t know what my AIBU is but I guess I want to know…does this get worse? Or does it pass??? He’s like Jekyll and Hyde. Either a delight or just horrible. Really brings the atmosphere of the house down. He has a 8 year old brother and he acts sillier than him! Any advice???