The Mishnah from which we formulate the four questions (Pesachim 10:4) describes an exchange between a father and son. According to the son's knowledge, the father teaches him. If the son does not have the ability to ask his father, the mother asks. And if the mother cannot ask, the father is commanded to ask himself.  Based on this mishnah, here are four questions about the four questions:

Why are these questions so important?

How did they become  the Four Questions?

How does the father know the answers with certainty?

 What is the point of asking questions of yourself?