What matter do Mr. Brownlow and Mr. Losberne discuss doing with regard to the people in Oliver's past? What are the problems?

Rose tells Mr. Brownlow the story that Nancy told her. Mr. Brownlow tells Mr. Losberne, who is indeed quite angry, but Mr. Brownlow is able to prevent him from doing anything stupid. Mr. Brownlow thinks they should wait until Sunday to see Nancy, and try to get from her as much information about Monks as they can, so that they can find him, and discover Oliver’s heritage. They all agree.