Mary Jane Gravy

I was on the phone today and Joseph came running up to me and asked when his other Mommy died. I assumed he meant his birth mom so after I got off the phone I asked him what he meant. Here's how it went:
Me: Joseph, who were you talking about when you said your 'other Mommy'?
Joseph: My other Mommy, Mary Jane Gravy.
M: Who's that?
J: The other Mommy I had when I lived in Texas.
M: Where in Texas did you live?
J: Big Hills Mountain.

That was the end of that conversation but a while later I asked him to tell me the town he lived in in Texas again. Here's how that went.
Joseph: I lived in the North of Texas.
Me: What else do you remember about it?
J: I lived by a big hill. We had to go up and and back down it again all the time.
M: Why did you have to go down the hill?
J: I don't know. I was scared of it when I was little because I fell down it one time but then I got braver when I was bigger.
M: What do you remember about being bigger?
J: I was a coal miner.

That was the end of that. I tried to ask more questions but he just wanted to play trains. Here's a funny thing though. Joseph has told Jesse and I many times that he wants to visit Texas. Out of the blue he'll ask how long it takes to get there and if we can go there someday.

Is it just me or is all this kind of strange? I wish I could describe how he sounds when he says these things. It's just so matter of fact, like he was describing what he had for breakfast that morning. It's really kind of spooky.