Secrets (1943)

A penniless private tutor is hired by a wealthy family in Provence. The brat is a reluctant pupil, but Michel, without any magic power, turns out to be a wonderful teacher and he wins them all over,not only the student but everyone, from the grumpy dowager to the clueless gorgeous blonde girl. But the best is yet to come:the boy's mother -a married woman- falls in love with the newcomer. And she becomes jealous of her young blonde goddaughter who has a romance with Michel