The depth of her anguish was actually overwhelming Han, and he pressed his lips to her forehead again, trying to think of the right words. He could give her his gut; that whatever had been wrong with Vader wasn't doomed to visit her children, that she was worried about nothing, that it was all right.
But she was his Leia, and an easy answer wouldn't calm her spirits.
"But it's hard. It's a lot of... everything." Han sighed, taking her hand. "Especially with Jaina here. I know she wants to meet you badly, and you'll be real proud of her when you do, but... I understand." He prayed this was the right thing. Anything to make that fear leave her expression.