"Didn't I promise to answer whatever you asked?"
Ah, right. Cathy almost forgets about this. Vincent promised he would answer any questions from her if she didn't peek while walking towards the middle of the lake earlier.
Cathy had a lot of questions in her mind, but she wanted to confirm something to start with.
"Vincent... you are not an ordinary photographer. But you are someone from the Regnz family." more precisely, Cathy said it as a statement, not a question.
Vincent did not think that the first topic that arose was his family origins. How did Cathy know that his family was Regnz? As he remembered, they had not mentioned Regnz at all during the introduction earlier.
Of course, Vincent forgot something. This girl was keen and heedful toward her surrounding, more than ordinary women. He shouldn't have been surprised if his girl had found out about his family during their meeting earlier.