After I Die

A husband asks his wife, "Will you marry after I die?" The wife responds, "No, I will live with my sister." The wife asks him back, "Will you marry after I die?" The husband responds, "No, I will also live with your sister."

Competition

There's an incest competition in my town this weekend.
I'm going to enter my sister.

Pain

A six year old comes crying to his Mother because his little sister pulled his hair. "Don't be angry," the Mother says, "Your little sister doesn't realize that pulling hair hurts." A short while later, there's more crying, and the Mother goes to investigate. This time the sister is bawling and her brother says... "Now she knows."