Aliens and Sisters

Little Man is exponentially learning and understanding things. He listens and ponders and has started to form thoughtful questions concerning his world. We had the following conversation in the car this week:

LM: Mama? I need to ask you a question. Goosey Lou told me something and I want you to tell me if it true.
Me: OK. What did she tell you?
LM: Mama? Goosey says she is an alien.
Me:
LM: She told me that she is an alien, mama? Is that true?
Me: No. She is not an alien. She was probably trying to tell you that the word "alien" means "stranger". For example, if we went to another country like France, then we would be aliens to their customs, language, etc.
LM: No. She meant REAL-LIVE-ALIEN from outer space.
Me: Well, she is not an alien from outer space.
LM: Are their aliens from outer space.
Me: I don't think so.
LM: I think so.
Me: Why would you think that there are aliens from outer space? (Thinking that he saw something on TV or from playing with kids.)
LM: You just said that there were aliens from France. You told me.
LM: My sister is an alien.

Later, when I spoke with his sister about the alien conversation, she informed me that she was trying to "expand his vocabulary" and taught him that another word for 'stranger' was 'alien'. She said it took multiple times for him to grasp it. I told her that he did not grasp it. He thinks she is an alien.

She looked somber and shook her head..."Maybe we should stick with the basics."