What do the 4 sons represent?
In the middle of the seder, we arrive at The Four Children (sometimes called The Four Sons) – the wise, wicked, simple, and one who doesn't know how to ask – whose views of the world uncover even more values that are important to us as Jews.
The Four Sons:
The Haggadah tells of four sons: first, the wise son—the Chacham, then the evil/rebellious son—the Rasha, followed by the simple son—the Tam, and finally, the son who doesn't know to ask. The scene of these four sons plays a pivotal role in the seder. We are moved by what they ask and by who they are.
The Torah speaks of four children: One is wise, one is wicked, one is simple and one does not know how to ask.
Fourth born children often develop the ability to deal well with people. This is probably a result of having to deal with all of those personality types growing up. They may also be great thinkers and able to manage challenging situations. They may also become analytical, hard workers and they can be pushy or passive.
The Wise Child—Young Adults
Ask him about his freedom. Ask him about his world views. Invite him to lead part of the Seder in order to prepare him for the day when he will sit at the head of the table with his family.
The Four Cups represent the four expressions of deliverance promised by God Exodus 6:6–7: "I will bring out," "I will deliver," "I will redeem," and "I will take."
If “teeth” represents the desire for pleasure and enjoyment, “blunting the teeth” of the wicked son can be understood as teaching him to control this pursuit of self-indulgence.
Now, instead of “Someone's mother,” we have, “Theodore's mother has four sons: North, West, and South.” And who is that fourth son? Why, it's Theodore, of course! So, looking back at the original question, it's now clear that the correct answer is: Someone! Did you enjoy the “Someone's mother has four sons” riddle?
In Judaism "Sons of God" usually refers to the righteous, i.e. the children of Seth. Angels: All of the earliest sources interpret the "sons of God" as angels.
Thus, paradoxically, the title Son of Man actually refers to Christ's Godly nature, alluding to the One mentioned in Daniel 7, while the title Son of God refers to his humanity, as seen in the Old Testament.
What is the fifth son Passover?
The idea of a fifth child is not a new one. In fact, the Lubavitcher Rebbe famously spoke about the fifth son of the Pesach Seder, but in doing so, was referring to Jews who had lost their faith and strayed from being Jewish. This idea has been one that my friend Rabbi Uri Topolosky has adopted and spoken about.
Passover is a Jewish holiday that honors the freedom and exodus of the Israelites (Jewish slaves) from Egypt during the reign of the Pharaoh Ramses II. Before the ancient Jews fled Egypt, their firstborn children were "passed over" and spared from death, thus dubbing the holiday "Passover."

Judah is the fourth son of the patriarch Jacob and his first wife, Leah: his full brothers are Reuben, Simeon and Levi (all older), and Issachar and Zebulun (younger), and he has one full sister, Dinah.
Every Passover, Jews set an extra cup of wine on the dinner table and open the door for the enigmatic prophet Elijah, hoping he will enter. An evolving symbol of hope and redemption in Judaism over the centuries, Elijah's return is said to mark the Messiah's earthly arrival.
References
- https://parentguidenews.com/articles/the-impact-of-birth-order-on-your-family-dynamic/
- https://en.wikipedia.org/wiki/Judah_(son_of_Jacob)
- https://darchenoam.org/pesach-educating-the-wicked-son-blunt-his-teeth/
- https://www.psychologytoday.com/us/blog/the-intelligent-divorce/201204/passover-four-sons-five-characters
- https://en.wikipedia.org/wiki/Son_of_man_(Christianity)
- https://www.rd.com/article/someones-mother-has-four-sons/
- https://www.parents.com/holiday/passover/how-to-explain-the-passover-story-to-kids/
- https://archive.jewishagency.org/nechama-leibowitz-haggadah/content/24076
- https://www.brandeis.edu/jewish-experience/holidays-religious-traditions/2022/march/elijah-passover-matt.html
- https://hasidah.org/the-fifth-child-at-the-seder/
- https://ccy.jfcs.org/four-children-passover-engage-children-teens-passover-seder/
- https://en.wikipedia.org/wiki/Passover_Seder
- https://en.wikipedia.org/wiki/Sons_of_God