Sis, I'm so sorry that you can't be comforted by your Dad. Just as Amy said, our birth families are not always there for us. Reality is not like all those wonderful TV families we grew up with. Wish it were so. I have an older brother, who just can't be bothered with family. Last time I saw him was a few years ago when I had a layover in Atlanta, told him when I'd be there, and surprisingly he & his wife showed up at the airport. Neither my sister nor I have heard from him since.
I do hope you'll try counseling to help you with your grief.
Hugs & Prayers,
Chris