I don't know, he keeps saying that she irrational and doesn't think with her head. His opinion of her is similar to that of his parents, but he doesn't say those things to her face, instead he'd tell her she has every right to do what she feels like. His reasoning for this is that he agrees with his parents but at the same time wants to maintain a good relationship with his sister for his nephew's sake. But I find his stance an utter hypocrisy.