My dad died in 2009, from leukemia which he had suffered from for a while. I was there in the hospital room when he died, pumped full of drugs, attempting to speak but not being able to. I could tell he was trying to say something to me with his eyes but I'll never really know what it was.
He gave me my love of science fiction and encouraged my love of video games. He was an avid WoW player and his guild even sent me a condolence card, which I still have somewhere.
My advice? Forgive and forget as much as you're able. Parents are only around for so long and you'll never get that time back. Yes they may be annoying, others may be truly awful and a relationship with some parents will never work. But to me it seems like you want one so yeah, be honest, and try as long as it works.