What are steps I should take to protect myself at work?

I work for a daycare center owned by a couple, well lately someone has called the state on us several times and the last time it was very serious and we are awaiting the outcome. I am a very loyal employee never have gotten written up, late and always dependable. The women involved with the incident that is very serious has been lashing out using cussing words in front of the kids and nothing has been done to her, now the owner's sister (the best friend of the teacher who done it)who is also employed is doing it too she verbally attacked me in my cl and nothing was done about it. I ended up getting fired b/c the owner say she didn't like the way I was talking. Fired b/c of my attitude, someone was in the office when I was fired(another employee after school teacher/ BUS MANAGER) some how it was over turned and now I'm awaiting my punishment, I came to the owner today to see what she typed and had planned she wasn't ready and proceeded to say everyone is coming to me telling me u called the state and that she an her hubby believe them and they didn't want someone like that working for them so tomorrow I have to speak with the hubby, her sister, and two more employees involved with the infant being left on the bus, I didnt understand why I should talk to them, they dont like me they want me gone they were pisst to see me this morning they are the ones going back telling her things I said which I dont talk to them on that level they are very unprofessional, its me against the owners , the owner sister and the sidekicks who will do anything to please them. How can I protect myself in this meeting with them and getting fired w/o unemployment? I've been with them 11 months the State have proved them to be Liars!