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Mary Winchester has been through a lot onSupernatural.
Until this season, Mary was an iconic perfect mother figure, Samantha Smith tells EW.

Credit: Diyah Pera/The CW
Coming back this year, one of the things I learned very quickly is she is now human.
She has fears; she has flaws; she makes mistakes; she gets confused.
She still has that piece of her that is this amazing mom but its being eclipsed by her circumstance.
The latest development in her relationship with Sam and Dean is her involvement with the British Men of Letters.
They are so different, Smith says of Sam and Dean.
She is learning how to navigate the different personalities of her kids.
you gotta talk to them both very differently to be heard.
At the end of the day, Marys slowly but surely returning to her sons lives.
Thats one of those things where somebody calls you out on your deepest fear, Smith says.
She cant parent them.
She can love them, but what is her place with them?
Supernaturalairs Thursdays at 8 p.m.
ET on The CW.