If the adoptive parents were not so sketchy acting I would assume they knew nothing about a twin - they just bought a baby, either sold by her mother or stolen or the old hospital ploy where the mother is out of it and they tell her the other kid died or something. But yes, Emma surely would have been adopted unless the bio parents refused and hadn't had their rights revoked.
I enjoyed it but also found the cell phone/transportation issues silly. I think Emma was on the bus before any type of warrant could be issued or bulletin put out and plus a foster kid stole something - not exactly a headliner, APB issue. I don't pretend to understand why Sutton didn't have a throwaway cell phone and fly or buy a car since she appears to have a lot of scheming skills and did have a tiny bit of time to plan. LOL on her wearing Emma's ratty clothes. Surely she could have picked up some generic non Suttony duds for her getaway.
Agreed it's a very dirty adoption and no way a cute white newborn wouldn't have been snapped up in 30 seconds. Actually I'd think there'd be a waiting line 10 years long (isn't it like 2-3 years for a white newborn to begin with) for beautiful baby twins, but what do I know??? But it IS the premise of the movie, so there you are. That said, one's almost expecting to hear they simply dumped poor baby Emma in the garbage the way this Princess/Pauper thing is written.
While Emma's theft isn't that big a deal, she did evade capture AND (though it was self defense and I think she should've hurt that turd waaaay more) assault---so we are looking at some fairly heavy stuff. BUT, in all likelihood, the greyhound clerk just looked at her ID, saw a rather innocent looking girl and called it good.
And yeah, Sutton comes across as someone who's pretty comfy with living the scheming double life, anyway---you'd think she'd already have a little "off to search for mommy" kit all set with less flashy clothes, a disposable phone, $$$$, rental car on retainer, etc....