We are not living today among Aryan nations where such members of our fleshly family relationship could be exterminated for marrying a Black, as was possible and was ordered in the early days of apartheid.
Being limited by the laws of the new South African nation in which we live, we can take action against those who marry Blacks only to a certain extent, that is, consistent with current laws. The law of the land forbids us to kill them, even though they be members of our own flesh-and-blood family relationship.