Me too, "Steel Magnolias", and another one that nobody has mentioned yet, "Stella" with Bette Midler. I've watched it many times but always cry at the end when the daughter gets married and Stella just "watches through the window".....so sad.....
Someone mentioned "Step Mom"....I saw that with my daughter and her fiance at the theater, I just sat there and cried and cried, my daughter kept handing me clean tissues. And I'm usually not one to cry "in public", so it was especially hard to sit there blubbering through it, but I just kept putting myself in that mother's position, how I would feel if I wouldn't be around to see my daughter get married, especially with my daughter's wedding only a couple months away at the time we saw it!