Stop domestic violence now...
"The worst fight I remember between my mum and my step-dad happened one Saturday when I came back from playing football in the park. I don’t know why they were fighting, but it looked bad. I could hear him cursing, things breaking and my mum crying. My heart was pounding. I was angry and ashamed that the neighbours could hear everything. My step-dad had probably just come home from the pub with his mates. The fighting was always worse when he drank..."
... it's not your fault and you're not alone - http://www.thehideout.org.uk