Define "Normal"

My nephew and his wife drove to town to visit my mother. I drove in as well and tagged along. As usual, we ate at the local crab joint. Now, my mother likes to reminisce, and everything is fair game. As we drove to lunch, the topic turned to my former loves. Just what I wanted to talk about (where's that damn irony button?).

Mother: "Tell [nephew & niece] about the one from school."
Me: "Well let's see. [A] was older, not quite divorced, bisexual, an alcoholic, a druggie... kind of a cross between a motorcycle mama and a hippie. Just what every mother wants for her son."
Mother: "Not that one, the one after that."
Me: "Oh, you mean [B]! Well, after [A] they got a little weird..."