Quote from Niles in Merry Christmas, Mrs. Moskowitz
Niles: What's going on? Frasier: Faye's mother thinks that we're Jewish, just play along. Niles: Okay. Niles: Why? Frasier: Well, it's important to Faye, Faye is important to me. Do you think you can pull it off? Niles: No problem. [checks oven] Ooh, ham! Frasier: Niles.