<human>: Hi everyone, first post here so please excuse me for any mistakes. 
I'll start from the start,

Growing up my 'dad' was never really around, He was a truck driver so he was gone many nights of the week. When he was home he got drunk and got voilent towards my mother. My mum left him when I was about 6 years old, but he stuck around for another 2 years trying to sort things out with my mum.

I have 2 younger sister's (16,19) and an older step sister and bother (23, 26) I didn't know So well (step sister and brother have a different father who is lovely) I never really fit in or looked like my younger sister's, I always felt left out. A few weeks ago me and my mum were talking and she tells me that there is a chance that I could have the same father as my step sister and brother,  which would explain a lot. 

I know that it won't change anything knowing who my father is, but I feel so lost not knowing who he is, a chance to find out my father isn't the abusive But I grew up with. I'd like to know peoples opinions if it would be worth finding out who my real father is, if it turns out to be the same father as my older sister and brother should I try to form a relationship with him? Does anyone have any similar situations?

Could you distill the essence of the text into 1-3 sentences?
<bot>: not sure if I should try to find out who my real father is, and if so should I try to form a relationship with him.