Not about the plot ...
I wonder if a lot of people don't understand the kind of film that this was supposed to be. The story isn't what's important here. It's a paper thin plot about the trials and tribulations of a show biz family on which to hang the real point of the film -- the Irving Berlin song catalogue. There were quite a few films from the late 30s on through the mid 50s that followed the same type of format. Most of those were bio-pics of a famous composer, singer, lyricist, etc. In this case, the music itself is the showcase. The plots were never much to write home about, but the music and performances were usually big and spectacular. The audiences of the day knew what to expect from this type of film, and they adjusted their "suspension of disbelief" accordingly. People today aren't familiar with this particular film genre (actually the film musical in general for that matter), and have a hard time getting past the thinness of the plot to what the film was really made for -- enjoying and being entertained by the lavish musical numbers.
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