She said some horribly vicious things to him, the man's grandson. Like, "Bringing shame to the family". Possibly she said being gay is an "abomination" and that goes "against nature". I don't know how she used those terms, but they are quoted. Those are (as S and M has already said) very abusive words and so is telling him she disowns him. My reaction, were that my daughter, would be similar if she were to abuse her child, my grandchild (mind you this is a hypothetical). My tolerance does not extend to abusers.