Where does he learn this stuff?

The other day when I came home Troy and Odin were in the living room drawing. Odin had written Troy's name on the paper, and Troy looks at me and points to the O and tells me that that is Dad's name. Odin then writes my name without saying anything. Troy points to the L and tells me that that is Mom's name. Odin and I look at eachother, and can just confirm that this is not anything we thaught him. The next day I asked at his school if it was something they had thaught him, but no one that was there had. Maybe another teacher that wasn't there at the time? Sometimes Troy really surprises the hell out of me with the stuff that he knows.