强调句It is where my father works that I work.It is where my father works that I work in.哪个对?

第一句对,这是一个强调句,简化句子即可.
I work where my father works.意思是：我在我父亲工作的地方工作.
where my father works作地点状语从句.
看看where引导的地点状语从句：
Wuhan lies where the Yangtze and the Han River meet.武汉位于长江和汉水汇合处.
Where there is water there is life.有水的地方就有生命.