Let's see if I remember this right (its been a LONG time since I've seen it)

They went to Tunisia to hide the disguised queen and to repair their SR-71. Jake Lloyd is working in the junk shop set and meets Liam when he stops by to buy a hyperdrive prop from a CG character. Of course, the Jedi mind powers don't work on CG characters, so they all go back to Pernella August's home set. There is some kind of chemistry between Liam and Pernella, and he wants to seem interested in her kid (if I was going after a cougar, that's what I'd do) so he tests his blood and found it infected.

Simple, no?