Humans have a hard time seeing nigger for what they are because they have been indoctrinated into believing that Humans have "wronged" the nigger in some manner in a "long ago" historical sense. People actually believe all the "slavery and poverty" bullshit. Humans find it hard to let go of this "guilt" because it makes them somehow the "equals" of all the "lesser peoples" of the world. Guilt can be a powerful weapon when used correctly and it has been used very well by our enemies for a long long time. The worst of it is that guilt only works on higher minded life-forms like Humans and does not work on those who would use the weapons of guilt against us. Your family does not and will not accept that they really are special and better than something else because it would first mean that they have to admit to being wrong about all the bullshit they have swallowed over the years. If the people in question are from certain age groups then they have fought very hard indeed to rebel against the truth for a long long time and aren't about to get off the kumbayah boat of diversity, ever. Accountability is never easy unless you have real pride of self, high intelligence and understand such grandiose terms as honor. Just keep the fire of truth burning brightly and when and if any of your family do come around then always be big enough to never say I told you so. Just keep the lines of communication open and provide honest truths and simple facts that nobody can refute. Find real history books, educate yourself so that you might educate others, remind your family how special and truly remarkable they really are and how they should expect more for and from themselves and others. That way when a nigger situation happens or indeed, as per your post, has happened in the past, your response is not "Well it's what he/she/it/you/they deserved" but instead "What did he/she/it/you/they expect to happen?"
sic gorgiamus allos subjectatos nunc
"All right, they're on our left, they're on our right, they're in front of
us, they're behind us...they can't get away this time"
- Lewis B. "Chesty" Puller, USMC