This sums it up greatly imo
"He (Karenin) has taken her daughter. Alexey was ready to agree to anything at first. Now it worries him terribly that he should have given his own child away to another man. But he can't take back his word. Karenin came to the funeral. But we tried to prevent his meeting Alexey. For him, for her husband, it was easier, anyway. She had set him free. But my poor son was utterly given up to her. He had thrown up everything, his career, me, and even then she had no mercy on him, but of set purpose she made his ruin complete. No, say what you will, her very death was the death of a vile woman, of no religious feeling. God forgive me, but I can't help hating the memory of her, when I look at my son's misery!"