N.P.
I wish I had some great advice but I just wanted to let you know I am in the same boat. My 3 year old has been impossible lately and she also has a new (6 month old) little sister. We did start a responsibility chart with things like getting dressed, eating breakfast and dinner, brushing teeth, etc and it started to help. At the end of the week she got to pick out a new book if she had completed all her responsibilities. It isn't working right now though because she keeps pooping in her pants and so she doesn't get her potty magnet. Anwyay, it's a Melissa & Doug chart I got at Home Goods for $10.
Good luck! Let me know if something else works!