Need Help Handling Family Woes...?

As trite as it sounds, I have a very dysfunctional family. I am the middle of 5 children. We are biracial, and that made it hard, at least for me, to make outside friends...I was close to my little sister for awhile, but she has not spoken to me for nearly 2 years due to a very petty disagreement. I am not close to any of my brothers either...there just never was a spirit of love in our home and as adults everyone seems to have gone their separate ways...recently, my nephew died, and he was actually beloved to all of us. As I said, it was rare to find love in our house growing up, but we all loved him. He committed suicide last month and was only 15...I had hoped that perhaps, the lining in that very dark cloud would be that it would bring us all together...it did not. There is a lot of tension when we get together and no one seems to care for each other. This has resulted in great feelings of inadequacy and loneliness on my part. I do not have other close friends and my family is certainly not close. I am a Christian and I have prayed about this and taken steps to show myself loving and available, but it is not received...any idea how I can begin getting this back on track????