Spring Thaw (2007)

Katelyn 'Kate' Weston, a country girl who became a lawyer and joined an L.A. law firm years ago, specializes in defending minors having committed violent crimes who nobody else takes on. She gradually got estranged from her family, but then her older brother Ryan asks her to return to the farm he runs with their dad Thane who has become impossibly absentminded. By the time he is formally diagnosed with serious Alzheimer, she realizes how badly she really knew her family, having ran from her past after the trauma of witnessing her mother's suicide at age seven, and tries to talk it trough with Ryan and dad while he still has lucid moments.