I watched it and I'm not sure!!!!!!!!!!!!!!!
I'll explain what I think happened.
Evil twin killed mum, wimpy twin went to clean up mess and shot dad (opportunity arose). In court, wimpy twin tried to convince everyone he did shoot his dad, evil twin said it was all him.
Jury found evil twin guilty and wimpy twin not guilty.
Much shouting ensued.
Wimpy twin walked out court and went outside and raised an evil grin. So I think they had swapped places.
I may be wrong though!