met someone who does ai cloning to "preserve legacy" as in your grandfather ,etc. Would this work?

So im assuming he makes the person ask a long questionnaire that feeds into ai, and then talks to ai to get a sense of a person. The question is does this actually make the AI have this persons personality where it can be thought of as asking your grandfather. Because that seems wild to me. you never know if your grandfathers prejudices were hidden. thoughts ?