One of my favorite film noirs of all time is a perfect entry for Mother's Day week, as it tells the story of the self-sacrificing Mildred, the mother who does everything in the world for her daughter, including giving up all the things she wants for herself, only to be betrayed by the increasingly evil child as she grows older. Okay, so it's not exactly a happy Mother's Day movie, but it's a hugely entertaining melodrama with some classic performances from Joan Crawford (who famously won an Oscar for this) but especially Ann Blyth as the horrible little two-faced Veda- seriously, you're going to want to see Mildred take down this demon spawn through any means necessary by the time the finale rolls around. This is one of the greats.
Original Trailer (unusually for the time, this is kind of a misleading trailer, which omits the mother-daughter story and plays up the film noir angle, but Mildred is anything but a femme fatale- that role actually belongs to Ann Blyth in the film):
