Schizophrenic mom

I am 13years old. Ive always had a happy familey intell we moved. I was 9 at the time. When I was 9 I found out my dad had cheated on my mom. He said they were just friends but I never belived him. Time passed and I was in 6th grade when my mom started getting sick. She would randomly start crying. She said it was just because she missed my old town and her friends. But later on it got worse. She would get VERY angy at times. Over small things. The worst thing in my life was one day she got into a fight with my dad and she got out a knife and was saying she was going to stab him. I tryed to get the knife away from her but she wouldnt let go. She cut me with the knife, then went after my dad. My dad is a tough guy. He took her by the neck and got the knife away from her. My mom screamed when he took her by the neck. I didnt know what to do, who to be mad at. We later found out my mom had something wrong with her. But we didnt know what. She went to a mental instatshion for about 2weeks. She came back and they said she was Schizophrenic. My dad did very well dealing with it. Being there for her. But she was alot to handle. I started cutting myself, but stoped after a while stoped knowing how my parents didnt need to deal with that.