"We love you kiddo... but you're adopted- don't worry about who your REAL mother was though. You know- the woman who you remember but don't really remember but maybe just remember from some dreams or something. Yeah, she wasn't important really. Yeah I know this means you're not a real princess. Hell in this galaxy you can be frickin' queen one day, senator the next and totally worthless soon after that- all before you're 20!
Now look... we need you to hop on this blockade runner, get some plans we stole and thake them somewhere. But watch out for this big dude wearing a black suit and flying around in a block of cheese. He's bad news! And for God's sake don't let him get close enough to you to test your blood or run a DNA test or torture you or something because he might realize that you're really his daugh.... *cough, cough*... er... anyway. Your adopted mom and I will leave dinner on for you. Bye!!!
Look dear... did we always have that small second moon in orbit here around Alderaan? Prrreeeetttyyyy..."