My gf family is racist what should i do?

my gf is spanish and i am part blk and her mom hates blk ppl when she told me that i didn't mind cause her mother had her traumatizing reasons so i let it go plus she never said nothing rude to me so i didn't mind up until i few weeks ago when i found out her whole family is racist her dad always makes commits like hes an ok blk boy cause your kids wont be too dark i just want to flip out on him but i always brush it off out of love 4 her but i am growing tired of this what should i do? i feel like ending this relationship