Questions and Passover
מתני׳ מזגו לו כוס שני וכאן הבן שואל אביו ואם אין דעת בבן אביו מלמדו מה נשתנה הלילה הזה מכל הלילות שבכל הלילות אנו אוכלין חמץ ומצה הלילה הזה כולו מצה שבכל הלילות אנו אוכלין שאר ירקות הלילה הזה מרור שבכל הלילות אנו אוכלין בשר צלי שלוק ומבושל הלילה הזה כולו צלי שבכל הלילות (אין) אנו (חייבים לטבל אפילו) פעם אחת הלילה הזה שתי פעמים ולפי דעתו של בן אביו מלמדו מתחיל בגנות ומסיים בשבח ודורש (דברים כו, ה) מארמי אובד אבי עד שיגמור כל הפרשה כולה:
MISHNA: The attendants poured the second cup for the leader of the seder, and here the son asks his father the questions about the differences between Passover night and a regular night. And if the son does not have the intelligence to ask questions on his own, his father teaches him the questions. The mishna lists the questions: Why is this night different from all other nights? As on all other nights we eat leavened bread and matza as preferred; on this night all our bread is matza. As on all other nights we eat other vegetables; on this night we eat bitter herbs. The mishna continues its list of the questions. When the Temple was standing one would ask: As on all other nights we eat either roasted, stewed, or cooked meat, but on this night all the meat is the roasted meat of the Paschal lamb. The final question was asked even after the destruction of the Temple: As on all other nights we dip the vegetables in a liquid during the meal only once; however, on this night we dip twice. And according to the intelligence and the ability of the son, his father teaches him all or part of these questions. When teaching his son about the Exodus, he begins with the Jewish people’s disgrace and concludes with their glory. And he expounds from the passage: “An Aramean tried to destroy my father” (Deuteronomy 26:5), the declaration one recites when presenting his first fruits at the Temple, until he concludes explaining the entire section.
גמ׳ ת"ר חכם בנו שואלו ואם אינו חכם אשתו שואלתו ואם לאו הוא שואל לעצמו ואפילו שני תלמידי חכמים שיודעין בהלכות הפסח שואלין זה לזה:

GEMARA: The Sages taught: If his son is wise and knows how to inquire, his son asks him. And if he is not wise, his wife asks him. And if even his wife is not capable of asking or if he has no wife, he asks himself. And even if two Torah scholars who know the halakhot of Passover are sitting together and there is no one else present to pose the questions, they ask each other.

למה עוקרין את השולחן אמרי דבי ר' ינאי כדי שיכירו תינוקות וישאלו אביי הוה יתיב קמיה דרבה חזא דקא מדלי תכא מקמיה אמר להו עדיין לא קא אכלינן אתו קא מעקרי תכא מיקמן אמר ליה רבה פטרתן מלומר מה נשתנה:
The Gemara asks: Why does one remove the table? The school of Rabbi Yannai say: So that the children will notice that something is unusual and they will ask: Why is this night different from all other nights? The Gemara relates: Abaye was sitting before Rabba when he was still a child. He saw that they were removing the table from before him, and he said to those removing it: We have not yet eaten, and you are taking the table away from us? Rabba said to him: You have exempted us from reciting the questions of: Why is this night different [ma nishtana], as you have already asked what is special about the seder night.
כדי שיכיר התינוק וישאל - כלומר ומתוך כך יבא לישאל בשאר דברים אבל במה ששאל למה אנו עוקרין השלחן לא יפטר ממה נשתנה וההיא דאביי לא פי' הגמ' אלא תחלת שאילתו:
So that the child will ask- it is as if by asking this he will come to ask more questions. However if he only asks the one question about removing the table, he is still not exempt from the Mah Nishtanah(four questions).

רָשָׁע מָה הוּא אוֹמֵר? מָה הָעֲבוֹדָה הַזּאֹת לָכֶם. לָכֶם – וְלֹא לוֹ. וּלְפִי שֶׁהוֹצִיא אֶת עַצְמוֹ מִן הַכְּלָל כָּפַר בְּעִקָּר. וְאַף אַתָּה הַקְהֵה אֶת שִׁנָּיו וֶאֱמוֹר לוֹ: "בַּעֲבוּר זֶה עָשָׂה ה' לִי בְּצֵאתִי מִמִּצְרָיִם". לִי וְלֹא־לוֹ. אִלּוּ הָיָה שָׁם, לֹא הָיָה נִגְאָל:

What does the evil [son] say? "'What is this worship to you?' (Exodus 12:26)" 'To you' and not 'to him.' And since he excluded himself from the collective, he denied a principle [of the Jewish faith]. And accordingly, you will blunt his teeth and say to him, "'For the sake of this, did the Lord do [this] for me in my going out of Egypt' (Exodus 13:8)." 'For me' and not 'for him.' If he had been there, he would not have been saved.