Apropo of nothing,
If 3PO belonged to Padme's family, instead of being built by Ani, he could be traded to Watto in exchange for the slave's (echo ROTJ.) Could then be bought by Lars along with Shmi.
The continuity error with Owen never bothered me. I didn't notice it while watching the film. I've rationalized it away by thinking Owen didn't live at the farm, he was only an occasional visitor to that very remote place.