All my siblings were molested, what are the chances that I was too?

I'm the youngest of four, I have two sisters and a brother whom is the oldest. We are all in our thirties now, and I have always suffered from anger outbursts, I don't remember anything ever happening to me, but it could have. Here's how it went, my brother was molested by this guy my mom was living with after my parents divorced, and then, my brother molested my sisters. I shared a room with my brother. What I'm really trying to figure out, it why am I the only one with temper problems, when I say problematic, I mean that I get both verbal and physical. I have recently lost my job over my anger issues, and am in anger management, which ironically, after just one session, is pissing me off.