"让父母刮目相看"可以用英文表达为"impress one's parents"或"make one's parents proud".

这个表达源自于英文中"impress"和"proud"的意思。"Impress"的意思是给人留下深刻印象，使人印象深刻。"Proud"的意思是骄傲的，自豪的。所以"impress one's parents"就是给父母留下深刻印象，使他们骄傲自豪。

例句：

I want to impress my parents by getting a high GPA and getting into a good college. (我想通过获得高GPA并进入好大学来让我的父母刮目相看。)
She has always worked hard to make her parents proud. (她一直努力工作，让自己的父母感到骄傲。)