Going to go INSANE!!!!

I am at my wit's end with my kids. There are five of them and the three dogs. My mother is going to come up and help, but my mother is driving me insane!!!! She tells me the kids need more "discipline." My husband does his best to help me out but theres only so much he can do. Since my eight year old son refuses to do his homework, I mean REFUSES. He throws a HUGE fit and kicks and screams and carries on. How should I get him to do his homework minus the drama?

My mom, she is VERY pushy. Theres no arguing with her, she ALWAYS has to be right or else. She's coming up tomorrow and is a lot more strict than I am with the kids. She'll make them do chores that are too diffcult or that they've never been required to do before. How do I set her straight? She also doesn't approve that I have a Doberman Pinscher with five kids, she says that dog'll kill your five year old if she falls on her. Which isn't true, Isis is the sweetest Doberman I've ever met and she ADORES the kids.

My eleven year old son picks physical fights with kids in school and was already suspended once. How do I get him to stop? We've tried grounding him, reasoning with him, but that doesn't work. My five year old got into my sixteen year old's makeup(which she left out) and Caroline, my sixteen year old daughter, threw a fit and stormed out of the house and didn't come back til the next day. We were worried sick because we couldn't find her. Maybe my children do need more discipline or maybe I just need a vacation. How do I give them more discipline without them completely hating me? Maybe I need super Nanny! Well, they have to clean their rooms and I have to supervise to make sure their idea of cleaning(shoving everything in a drawer or under the bed) isn't used.
Grace
Mommy to: Caroline,Darby,Alessa,Kris and Casady