Losing siblings

I am in highschool I just entered 10th grade and in May of freshman year my 2 year old little brother (now 3) fell into our pool when my step dad was suppose to be watching him and by the time he found him cpr wasn't working and he couldn't be saved. My step dad being alone and under bad influences was taken in and is in custody awaiting final trial as we speak and he thinks I don't want him in my life. My father is a horrible man and I was raised by my step dad since I was 4 (now 16) I really need his guidance through life and problems but he thinks I hate him and refuses to call the house out of fear. My mom misses him so do I, but my bf and friends and other family blame him and are full of anger and curitosy of what really happened. How do I get them and him to understand?