Hmm…most touching in a saccharin sweet way? Steel Magnolias comes to mind. Terms of Endearment and Stepmom are two others. Personally, I liked Delores Claiborne. It’s a mystery that slowly unravels the truth about a mother’s love for her daughter.
Terms of Endearment
Postcards from the Edge
Moonstruck (With Cher as the daughter)
Hairspray
What’s Eating Gilbert Grape
Mask (with Cher as the mother)
Stop or my mom will shoot/Throw momma from the train…No?
Kramer vs Kramer, although it focuses on divorce & custody battles, I think in the end it shows the true courage of a mother.