I recently watched a movie, Make Way For Tomorrow, about which Orson Welles said: "It could make a stone cry."
Cry, yes, of both joy and sadness. This movie came out in 1937, towards the end of the Great Depression. Its plotline was thus very actual, as it shows an old couple being unable to finish paying off their house, and losing it consequently; none of their grown children are either willing or able to take them both, and they have to part ways for the first time. Make Way For Tomorrow is a sentimental film, but mainly because it is naturally acted. Victor Moore and Beulah Bondi are particularly believable as the Cooper couple, and their complicity is so realistic that watching them reminiscing on their honeymoon, for instance, feels like eavesdropping on elderly family members. This familiarity with the characters' personalities is the main element which made this movie so moving and so beautiful to me. And, as you must know, I did indeed cry.