Heritage And BloodLine

Being a Skywalker, Jack had an extremely high midichlorian count and was gifted in the force. Though he never knew this was from a young age, he quickly understood once he was discovered by his master, Liam Kenobi. Thought to be born in around 36 ABY, he has no track record of parents, hinting at the reality of being conceived by the force itself, like Anakin Skywalker. The fact he was created in the amiss of the destruction of the first order, makes little sense. The other theory is that he was created by Pura Malum, as the Sith lord knew he would need a powerful apprentice to help him destroy the Jedi, and obtain galactic dominance. He did this by combining midichlorians with a highly reactive sith holocron, somehow creating life, creating Jack Skywalker. This theory technically means Pura is Jack's Father, but this is up for debate.

If he WAS created by Pura Malum, it is most likely he was created on Exegol, a mysterious planet that was not on record. Pura then would of manipulated the Midichlorians inside of Jack's Mother's womb to create him. He was born with unexpectedly, as his mother never had intercourse with anyone.