MAN, what a Fuckin' bastard, Aya!!!! I DO hope that you're parents split cos obviously he doesn't give a damn about u guys! Hey, I know a family whose dad did the exact same thing (well, sorta) in the end the mother became such a stronger woman and when her son got married, he livid his father's side by using his mother's surname instead of his dad's. When his dad asked why he simply replied "You were never there for us. Whether or not you wanna come, I don't care."
Are you still living with that animal who calls himself your dad? Better kick him out, that swine!