Editing was so obviously biased it was hard to make an assessment, really, but I think it probably did improve.
It all went a bit downhill, in predictable fashion, when Jo went away but at the end of the programme Matthew seemed to be accepting that he had to make an effort to chill out and control his anger. He was still pushing the boundaries as hard as he could go, and waaaaayyyy too violence for me, but at least they had some sanctions to teach him about that. He's obviously going to go through a sort of delayed toddlerhood while he learns to control his emotions.
Mum did move over to make some room for his dad, though, and that bit of the relationship seemed to be soooo much better.
Little sister was just being a two year old, really, and will probably be just fine if mum and dad can grow a spine.