Traditionally, at this point in the seder the "Four Sons" are talked about.
The Torah refers to four sons: One wise, one wicked, one simple and one who does not know how to ask a question.
The Wise Son asks: "What are the testimonials, statutes and laws our God commanded us"
You should tell him about the laws of Pesach, that one may eat no dessert after eating the Pesach offering.
The Wicked Son asks: "What does this drudgery mean to...