It’s Christmas and the family has gathered in Chicago. During an otherwise normal holiday dinner, the hostess, Ruth (Blythe Danner), with a sweet smile asks her guests, “And how do you two know each other?” Given that Nick (Michael Shannon) and Bridget (Hilary Swank) are brother and sister and Ruth is their mom, it’s a bit awkward. It is also a bittersweet reminder that her Alzheimer’s isn’t getting any better. Only a few nights ago, she wandered out in a snowstorm, wearing her…