Agreed. You have to talk to your siblings/relatives and influence them positively. Teach them about Islamic and African history etc etc. I've done that over the years with my younger relatives and walahi, its made a huge difference in their sense of self and pride.The OP is correct, if you're not the person that sets the narratives by shaping his values, beliefs and character then the poisoned wider society will do that job for you to devastating effects.
When these scientific materialist, anti-humanists, irrationalists, satanists, closet white supremacists get a hold off him, it's game over, he will inadvertently serve his oppressors, argue in favour of them against his own
He will suffer from intense self-hatred and even take up their religious beliefs as you can see with many of the sspot users on here, indoctrination is a powerful thing and humans in general are screwed once this happens.
But on a serious note though. This site have affected me in some ways