This Jax was the youngest child of a carpenter from Dubrillion. He emigrated to Coruscant so he could find more interesting places to get drunk at. Jax was beaten often, and cried a lot. Eventually, Jax called the Coruscant Social Services, and was taken in to a foster home and raised by a pair of Vodrans.
He had two brothers, Jax Pavan and Jax Pavan, who stayed on Dubrillion doing something or other.