Parents need to know that while this movie's content is squeaky-clean (with sexuality limited to a few brief kisses), the plot behind the songs and dances is racier than that of the typical musical, featuring romantic complications, infidelity, and a predatory female character who seems intent on turning Gene Kelly's character into a gigolo. Younger kids probably won't get the innuendos, while older ones may be a bit discomfited by the romantic duplicity of the film's characters.
A 50+ year old musical with mediocre acting. It is interesting visually, but the ending is a ridiculously long number that is 100% unneeded. Mostly for Kelly's fans, or real old movie buffs. Probably the worst Best Picture winner I've seen thus far.