This is the factory my father worked in这个句子对吗?

This is the factory my father worked in这个句子对吗?
This is the factory my father worked in这个句子可不可以看成是一个定语从句,关系词在句中作宾语,关系词省略?那This is the factory which my father worked in这个句子对吧?

对 是定语从句
还可以说成 This is the factory where my father worked
再问： 你的意思是关系词which在这个定从中做宾语可省略？那This is the factory which my father worked in这个句子对吗？谢谢
再答： This is the factory which my father worked in 这个句子对 which 是关系代词 代替了factory 做宾语 可以省略 in which 在定语从句中表示地点 可以用关系副词when 代替
再问： 为什么是when？应该是where吧
再答： 。。不好意思 打错了 是where