Martha Ertman, author of Love’s Promises.

Topic: How formal and informal contracts shape all kinds of families.

Issues: The difference between a “deal” (I cook dinner and you wash the dishes) and an enforceable contract; Type A families (heterosexual couple raising a biologically related child) vs. Type B families (pretty much every other kind of family imaginable); how contracts shape and sustain families as opposed to simply being cold and calculating.