ארבע כוסות

Rav Yehuda said in the name of Shmuel: The four cups of wine during Seder night must have enough to fill a generous cup. If you drank the four cups without diluting them with water, you have fulfilled your obligation. If you drank the four cups all together(Rashi's understanding) OR If you drank the four cups in a straight fashion without following the order prescribed by our Mishnah(Rashbam's understanding). If you poured bits of your glass of wine to members of the family or others sitting around the table, you have still fulfilled your obligation even though you haven't drunken the entire glass of wine. If you drank the four glasses of wine without diluting them, you have fulfilled your obligation. Rava says You have fulfilled your obligation of drinking four glasses of wine on Pesach, however, you have not fulfilled your obligation of making yourself free as a slave. If you drink the four glasses of wine one after the other without pausing in between to mention the required parts of the Haggadah(Rashbam's understanding) then Rav says You have fulfilled your obligation of drinking wine, but you have not fulfilled your obligation to drink the four glasses of wine on Pesach night, If a person poured from his cup to his children and did not drink a full cup, he has still fulfilled his obligation. Rav Nachman, the son of Itzchak says He only fulfils his obligation if he drank the majority of the glass of wine. The Gemara now asks on the previous statement that requires one to drink the majority of the glass on Pesach to fulfill the mitzvah of four cups: The Rabbis taught us: Everyone is obligated in drinking four glasses of wine, be it men, women and children. Rav Yehuda says What purpose is their in that children should drink the four cups of wine?