Mrs. Claus

William and I were driving around looking at Christmas lights tonight and he asked me who Mrs. Claus was...here is the conversation that ensued.

William: "Mommy, who is Mrs. Claus?"
Me: "She is Santa Claus's wife."
William: "Wife?!"
Me: "I am Daddy's wife and Daddy is Mommy's husband."
William: "Who is my husband?"
Me: "Girls have husbands and boys have wives."
William: "My wife is Santa Claus."