英文母女

father and sonmother and daugther

父女、father-and-daughter母女 mother-and-daughter

mother and daughter

作定语：mother-daughter 如mother-daughter relationship作名词：mother and doctor endearment(母女情深：the Terms of Endearment）当特指时才需要用the mother and doctor，如The mother and daughter shared their life together, supporting each other through years of hardship.母女俩相依为命，度过了苦难的岁月。否则像Virtue and ha ine are mother and daugher. 美德和幸福犹如母女。则不需要用the英语专业又如何，英语专业不意味着就多强~虽然我也是，奥，不是，我是翻译专业，sorry

父女: father-and-daughter 母女: mother-and-daughter