James grinned. It was just slightly forced. Probably not enough for Harry to really notice. Mentions of Lily did that to him. "Eh. I'm not really sure. Up to her, y'know. But I'd like more than one kid. I like kids." That was plain enough to see. James spent plenty of time with Bree and Brenna.
At the question, James straightened a bit in his seat. "I... I dunno, mate." He wasn't being entirely honest. But he didn't want to break it to Harry.