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(CNN) Felicity Jones is, not unlike real-life notorious figure she played in "On the Basis of Sex," a woman of her convictions.

On this day, the stakes are decidedly lower than the ones faced by Ruth Bader Ginsburg in the film, but Jones is tough in her stance: "The Family Stone" is, she argues, a feel-good movie.

"She works out who she is in the end," she says of Sarah Jessica Parker's character.

Still, how can a film so depressing -- cancer, Christmas, family -- be considered feel-good?

"It's also about the family...of course, part of life is going through loss and it's how you recover from that together."

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