"Now, tell me something. Can this innocent little girl have a personal or blood relationship with all of you at the same time? I am impressed. You must all have been one big happy family. Otherwise you wouldn't have come running to the rescue of your precious Lulu with such a huge force. Blood really is thicker than water." Zavier's tone had turned into a light one but his words were still laced with poison.
Sometimes poison is the only remedy for a malady. Zavier was using such words to rile them up so as to help them shatter the illusion that the girl had caught them in.