<div>In Derech Sicha pg. 239, R' Chaim Kanievsky is quoted as saying that while it would seem to make sense that once the son knows all about Yetzias Mitzrayim there is no longer a Halachah to tell him, it may still be that there is a Mitzvah at any age, even an Am HaAretz to a Talmid Chacham, because every time he hears the story something new will be added, </div>
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<div>The one conversing with him added based on the Ramban that the yesod of our Emunah is the tradition handed down from father to son. </div>
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<div>RCK added that the Steipler would learn with him consistently, stating that he wished to fulfill the Mitzvah of teaching his son Torah.</div>