[Disagreeable... ha. That sounds about right. He hasn't spent enough time with Ai to tell, but he can see the physical resemblance between her and Kaname.]
Kaname can be difficult. [But Haruka's words are only fond. He doesn't actually know much about his son in his later years, but he loves him anyway.] But he is a kind child.
[Sometimes troubled, but that's why they just make sure he knows they love him, no matter what. So far, the worst Kaname has done was be resistant to their affections, breaking his mother and father's hearts.]
Ai is probably much the same. It just means they need more affection.