Boys raised mostly by fathers?

my nephews live with their father ( who is a racist denies his blackness cuz hes light/is just all around rude and a n yes the kids act like him sometimes) , they come here every other weekend and we TRY to instill good behavior and gentleman like qualities but i KNOW it isnt doing much they LIVE with him i just want to know is there hope or its just how its going to be bc they live with him ....