Hi I have 3 step children all live with us permanently. We’ve lived together for 5 years. The 13 year old is a nightmare to live with started getting worse about 2 years ago. he constantly disrespects me he point blank tells me and his dad he hates us (no anger,hatred or being upset). He lies all the time try’s to get everyone else in trouble. He hurts the others and thinks it’s hilarious but will always try and blame them. He’s manipulative and sneaky. We’ve been to counselling but their techniques seem to make him think he can get away with everything. I’m struggling and don’t know how to handle him anymore. I’m not a shouty person but I’m starting to loose myself and feel myself wanting to scream. We’ve tried grounding, taking things away, talking the issues through but nothing phases him. Any advice?