Jack's "Son"

After finally witnessing the end to Lost, I'm pretty much satisfied with what the producers and writers gave us. That is except for Jack's son in the flash-sideways/afterlife. After the finale, we learn that what we thought was an alternate timeline turned out to be where all the characters go after they die. In this afterlife we see some changes in the character's lives such as Desmond being on the plane and Jack having a son. But how can Jack have a son in the Afterlife if all the people there were alive at some point in real life and eventually died. Jack never had a son in the OT, so how can he have one in the AT? Someone please explain this to me!

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