He looked at his sister and smiled at her, "Well, I will leave it up to you, but don't you think your friends will worry about you?"  He had missed her as well.  He would very much like to have her with him at the meeting but at the same time he was worried about what the Professor was calling them for.  As he looked at her, the sweet, innocent look in her eyes caused him to hug her gently, "Of course if you come with us we can have lunch AND dinner."