This is a long story but please try to stick with me. I really need some advice and I'm feeling confused and just helpless.

My stepfather was very abusive toward me and me alone from the time he came into my life (age 9) by the time I moved out at age 18. He and my mother have 3 children - my oldest sister is 14 and I am 24. So there is quite an age difference.

I have always been the odd one out in the family, and my stepdad just... hated me for some reason. He pushed me, punched me, gave me concussions and was verbally and mentally abusive on top of all that. He never did this to anyone but me, not my siblings or even my mother. I have had some serious anxiety and depression issues as an adult because of it.

I cared about my siblings a lot but I needed to go. I moved out of the state as soon as I could to go to school and live my life. I got married, have started to heal... I've operated for a long time under the assumption that what happened to me wouldn't happen to them because they are actually his kids and he stopped drinking and... I guess I was in denial because I didn't want to think about my sisters going through what I did.

My sister texted me today and told me that he pushed her into a chair. She says it's the only time he's ever done anything like that but I'm honestly sick to my stomach. What could I do if he starts abusing my sisters? My mom pretends it never happened and I doubt she'd be any help.

Has anyone else gone through this? I feel so helpless right now, and any advice would really help me. I feel totally powerless and I'm seriously on the brink of an anxiety attack. :(