If Larissa herself had not necessarily met Aster's biological father, who said Wendy would even know about him? Aster's question made her a little frantic, and she asked him in return, "Why are you asking about this?"
"I want to find my daddy," Aster said seriously, and Wendy was shocked. Her first reaction was to inform Larissa, but she still had to deal with Aster for now.
"Why are you suddenly thinking about finding your daddy?"
This kid, having grown up to his current age, had never asked