"She's a child," he said, trying to mask his distaste, although those simple words should be enough to explain why Cass was nervous around her. Children were evil creatures. "I believe the problem as you see it is that he would love her like he'd love one of his own: not that much." Percy didn't think it was a problem at all.
"Still, whenever you want to come by the house, you can even bring them." That was as much of a concession as he was willing to make.