My Ds has recently become very defiant shouting "NO" at us when we ask him to do anything, continuing to do things he has been told not to and knows he shouldn't be doing, ignoring us and being mean to hes 3.5 year old sister.
Is this a phase that others have gone through?
What can I do to snap him out of it. I can't ignore some of hte behaviour he has exhibited in the last week or so it is either nasty or downright dangerous - like funning out of shops when out with me or hurting his sister.
Tried all the usual time outs, warnings and then removing treats so now what?