- Hey, I was wondering if anybody could help me with question 9.11 about finding who the
question: P. 317
A popular children's riddle is "Brothers and sisters have I none, but that man's father is my
father's son." Use the rules of the family domain(Chapter 8, page 254) to show who that
man is. You may apply any of the inference mehtods described in this chapter. Why do
you think that this riddle is difficult?