A: Hey, sister. I want to test your IQ. You ready?
B: Sure, go ahead.
A: Who am 1?
B: Ah, this is a question? You are my brother, my blood brother, of course.
A: You are right. OK, move on, if my mom is not your
mom, but my father is your father, who am I then?
B: You are my half brother, I am your half sister, right?
A: Yes. The third one is if we were born at the same time, who am I?
B: Simple, you are my twin brother.
A: Right again. Next one is if you were born by my
daughter, who am I then?
B: Er. You are my grandparent. I am your grandchild.
A: Great. if you were born by my granddaughter, who am I?
B: You are my great-grandparent. I am your great-
grandchild.
A: OK. How do you call our father's brother and sister?
B: Uncle and aunt.
A: What about their children?
B: They are our cousins
A: Then what about their childrens children?
B:Their daughter is our niece and their son is our nephew. Am I right?
A: You re amazing.
B: Well, a piece of cake.