My parents both are teachers. My parents are both teachers.两个都对？

我是这样理解的：
My parents both are teachers. both为代词，作my parents的同位语。
My parents are both teachers. both为副词，修饰Be动词are.

都对 不过后者中的Both是形容词来修饰名词Teachers 而不是你说的

both of my parents are both teachers.

My parents are both teachers. 对