Is OTHER wrong in the post ? POST : Forgive me for I am on mobile so please excuse the grammar mistakes that may happen or random auto corrects. 

For Context: My mother and real father have lost custody of my little brother and I when I was 5 and he was 3, my grandparents gained custody of us and I have been living with them since. My mother divorced my real father and I have no idea where he is. When I turned 9, my mother married my step-father. For years I had been wanting to move in with them, but up until about two years ago, my mother had threaten me with something I did as an ignorant child which changed my entire outlook on her. 

Recently my cousin (who lives up the road from my grandparents house) went into a shock of sorts (she has diabetes and lives alone since her parents died). I had decided that I should go live with her. I am 18 and can move out of my grandparent's house if I so choose. 

I figured it would be a good idea considering what has happened. I should also mention that unless my Uncle had wanted to show his brother this monitor they had at their house,  they were away to see my other cousin give birth to their first grandchild, my cousin could have died from the said shock as she was there to feed their dogs. It would also help with my situation regarding my baby brother. (He's an A grade dick and asshole, won't go into detail, but I just dislike living with him) I can also stay near my grandparents as my grandfather had recently went to the hospital due to a near stroke incident and I do not want to be too far away from them.

Though I started thinking about how my mother and step-father have been pushing me to live with them ever since I turned 18 and am soon going to college. As of late, I have either said I'm good or just flat out ignored whatever they were saying in regards to living with them. 

I'm mostly thinking of myself here as my step-father REALLY creeps me out. He always wants to see me when him and my mother would come and visit. He would constantly text me just to get me out of my room. Hell there were times where he would message me on FB at 2 in the morning! He happens to drink and considering I look like my mother, I am afraid something would happen. 

Would I be the asshole if I went to live with my cousin instead of them?