What is the mother reply to his question?

I see no response to a question in Chapter Eleven. In Chapter Ten, however, we learn the following;

In a moment he would ask her, "Are we going to the Lighthouse?" And she would have to say, "No: not tomorrow; your father says not." Happily, Mildred came in to fetch them, and the bustle distracted them. But he kept looking back over his shoulder as Mildred carried him out, and she was certain that he was thinking, we are not going to the Lighthouse
tomorrow; and she thought, he will remember that all his life.