Hi. I’d suggest this is pretty typical teenage behaviour and is probably what he’s hearing in school on a day to day basis (if he’s in mainstream school). If so, I think that providing intervention is likely to have limited success. Instead, could his mum try to manage it by ignoring? My youngest son (who has ADHD) went through this phase at a similar age and whilst it is extremely annoying (!), it possibly isn’t priority in the whole scheme of things?
