1. Extend the program by adding rules for the following family
relationships (add more people if necessary, so that you can check your
results):
brother(X, Y) where X is Y's brother
sister(X, Y) where X is Y's sister
son(X, Y) where X is Y's son
daughter(X, Y) where X is Y's daughter
married(X, Y) where X is married to Y
ancestor(X, Y) where X is Y's ancestor
What problems do you encounter? What is the nature of the problems?
What solutions (if any) can you suggest. (Reading the literature on Prolog will
help.)