4yr relationship muslim guy and hindu girl, my parents saying no. what should i do?

we both are 30 man, i dont know what do. she is ready to convert, her parents are supportive of her converting(though her relatives are not ok). my dad says kaffirs blood shoudnt come to our family. and saying they will disown me. i am thinkning of running away from my family. iam a preacticing muslim. i dont wanna leave islam and she is the one, my dad says if i marry her, i shoudnt visit his grave. is anyone ranaway from parents and what happened later? did your parents eventually talked again?