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Phrase(s): He that would the daughter win, must with the mother first begin.
Prov. If you want to marry a woman, you should find a way to impress her mother, so that the mother will favor her marrying you. • Harry: I think I want to marry Gina. Bill: Don’t propose to her until you’re sure her mother is on your side. He that would the daughter win, must with the mother first begin.
McGrawhill's American Idioms And Phrasal Verbs