回复：入美籍后户口本上的名字还应该在上面吗？我的问题和你一样，上学工作户口转来转去

Not your 户口, should be your parents.

It is very unlikely you will be on your parents current 户口, but You must be on your parents 户口 in some period of time, so does your sister. Once that is found, all the relations can be established. In fact, from my experience, it is also the base for the notorized birth cert. The question is how painful it is to track it down.