Why is this uncle different from all other uncles?

We had Passover Seder at my brother's house last night and as usual the highlight was a surprise visit from Elijah the Prophet. My older brother knows the drill at this point (I have two brothers - one hosts, the other is the prophet). We wrap him in a sheet and a tallis and he wears a wool Rasta hat and sunglasses and then walks in doing the customary Elijah jig. He grabs the wine glass and shimmies out as mysteriously as he arrived. I'm not sure why he takes the whole glass but that's his shtick. The adults are cracking up at this point and the kids are vacillating between fear and exhilaration. My son turned to me in the car later and asked if that guy was Santa. My nephew is almost six so I'm not sure how much longer he'll believe in our Rastafarian prophet. So far no one has made the connection between the entrance of Elijah and the disappearance of Uncle Aaron. I guess we're good for another year.