Woman I know (GF) was warned early by her boyfriend that they likely could never get serious because of his grandmother. Naturally, that went out the window and they fell in love, years have passed and marriage is pending. This warning came because of GF's race.
Several years before, BF's sister had brought home a man, who happens to be the same race as GF. Grandma lost it, flipped out in front of the entire family. To this man's face, declared that they were an "inferior race" and that the sister was out of her will for as long as she was dating him. (Grandma's net worth is somewhere in the range of $30M - $50M, enough that she can boss around her grandchildren and expect it to get her somewhere, because even spread across the family, everyone can be a millionaire when she passes. This threat is apparently employed liberally.)
Sister marries this man, relationship with grandma is destroyed, and they don't invite grandma to the wedding. Sister is effectively excommunicated from the family, not because they're racist, but because they want to stay in grandma's good graces and are too afraid to be seen as taking sister's side.
BF now is stuck learning from this lesson. He is cool as a cucumber about being removed from the will, but faces the difficult task of still going through the process of grandma finding out he is dating/will marry someone of that race. He plans to sit grandma down, say he's marrying GF no matter what, and money won't influence that decision. He wants to see if there's a middle ground where he doesn't have to go the rest of his life without speaking to his grandmother. I expect she'll just throw a temper tantrum because her threat of "out of the will" can't influence yet another grandchild, and whatever middle ground he's envisioning will never present itself.
Based on the stories I'm glancing over in this thread (trying to catch up), maybe he and his sister will glad to be out of the will. Might just save them a lot of added drama when the time comes.