What should I do about my father/family?

I grew up without my father. Neither communication nor child support from him whatsoever and still to this day. I feel abandon by him. My mother struggled to care for my older sister and me. I have another older sister who has been taking care of my father. When I tell her how I feel she gets angry with me. She tells me I’m being disrespectful and hateful. I really am hurt by the fact that he never tried to reach out to us. It sickens me to know my sister and aunt (father’s sister) could even defend him. They gang up on me and make it seem like my mom said bad things about him to me (which is untrue). They think I should make the 1st move. I do not have any desire to have a relationship with him because I feel like I know he obviously does not desire to have one with me. I feel like I am trying to protect the child I was or that is inside of me now that I am an adult. Last time I saw him it was on my birthday and he didn't even tell me happy birthday (sad). I don't think I ever recall him telling me he loves me (I’m just so numb to it): Once I told my aunt this and she told me "Well that is how he is.. It doesn't mean he doesn't love you.” I’m having major issues with being pressured to accept "it". And I cannot... Would I be wrong or disrespectful if I were Brutally Honest? Should I just cut ties with my sister and my aunt our relationships are not that good they were not there and I feel they really do not care about me? Any good advice would be appreciated! (I hate fathers day)