It was kind of lost in all the other stuff that happened in ep 1 but it's worth remembering that Anita wasn't actually supposed to be the family's synth, she swapped places with the chosen synth back at the factory so whatever memory wipe happened prior to that, she definitely still has, and exercises, her free will.
I was totally not expecting Leo to be part synth, I was convinced he was human. I'm really enjoying the series. What will be next for Anita if she actually does get returned, I was half expecting her to do a runner when Laura said she was taking her back!